Retele
What does an UDP datagram header contain?
Source Port, Destination Port, Length, Checksum
Source Port, Destination Port, Urgent Pointer, Data
Sequence Number, Acknowledgement Number, Checksum, Length
What does DHCP provide to the client?
IP address
MAC address
URL
Which of the following has the highest transmission speed?
coaxial cable
electrical cable
optical fiber
How many bits does a MAC address contain?
24
32
48
40
Which of the following translates the internet domain and host names to IP addresses?
domain name system
routing information protocol
network time protocol
When displaying a web page, the application layer uses the:
HTTP protocol
FTP protocol
SMTP protocol
Which Application layer protocol does electronic mail use?
SMTP
HTTP
FTP
TCP
Which of the following is a transport layer protocol used in internet?
TCP
HTTP
UDP
PPP
Wireless transmission can be done via:
radio waves
microwaves
infrared
Which of the following tasks is done by the data link layer?
framing and link access
flow control
error control
channel coding
What is a Computer Network?
Two or more computers.
A router and a server.
A collection of interconnected devices.
Is it better to use TCP or UDP for a messaging application?
TCP.
UDP.
Both are just as good.
Broadcasts like online radio or video streaming are transimitted over:
TCP.
UDP.
A combination of both.
Which of these protocols is used for file exchange/storage?
SSH
TELNET
FTP
What does FTP stand for?
File Transfer Program.
File Transfer Protocol.
File Transmission Program.
What IEEE standard do Wi-Fi networks use?
802.1
802.11
802.13
IP addresses that do not use subnets consist of:
a network, server and host portion.
two network portions.
a network portion and a host portion.
Can you have a network that supports a maximum of 54 IPs?
Depends on the router.
Yes.
No.
Can you have a client with the IP 193.178.4.0 in a network?
Yes, if the network is large enough(i.e. the first IP is 193.178.2.0)
No.
Depends on the subnet class.
Is the IEEE standard 802.13 used?
No.
Yes.
It was deprecated.
Is 802.11 ac the fastest Wi-Fi standard?
No, it's the slowest.
Yes
Only if it is setup correctly.
Does a device that only supports 802.11b/g/n benefit from a router with 802.11 ac capabilities?
Yes.
Only if the router is backwards compatible.
No, it will run at 802.11b/g/n speeds.
Is the MAC address specific to a device or given by the network?
Specific to a device.
Give by the network.
The first half is device specific.
Can a device have a different IP address each time it connects to a network?
No.
Yes, if the IP is dynamically allocated and the IP from the previous session is in use.
Only when the IP is statically allocated.
How do you connect a switch to a router?
Copper straight-through wire.
Copper crossover wire.
Wirelessly.
Can you connect a computer to a server using a straight-through cable?
Only if the server is older than the computer.
Yes.
No.
How many binary numbers are in an IP addresses?
4
12
32
56
Which are the two parts of an IP addresses?
Network and subnet
Physical and logical
Network and host
Physical and port address
Having an IP and a netmask, how do you find the last IP of class to which it belongs?
Logical ‘and’ between IP and netmask
Logical ‘or’ between IP and netmask
Logical ‘and’ between IP and netmask negated
Logical ‘or’ between IP and netmask negated
What is the purpose of an IP address?
A unique location identifier
A unique identifier for a computer
A network location identifier
None of this
What does /28 represents in the IP address 152.16.168.196/28?
The number of bits in the host portion of the IP address
The number of bits in the network portion of the IP address - C
The number of hosts in a network
None of this
What is the net ID for the network in which 172.16.66.0/21 is located?
172.16.0.0
172.16.36.0
172.16.48.0
172.16.64.0
Given the network mask id of 255.255.240.0, how many hosts can you have?
1024
1022
4094
4096
What is the maximum number of IP that you can use on a local subnet that uses the 255.255.255.224 subnet mask?
16
21
30
32
What is the net ID for the network in which 172.16.66.38/24 is located?
172.17.66.0
172.16.64.0
172.16.66.1
172.16.66.0
What is the net ID for the network in which 192.168.242.5/20 is located?
192.168.241.1
192.168.243.0
192.168.240.0
192.168.242.1
Which of the following commands can be used to find the IP address on UNIX?
Ipconfig
Ifconfig
Iplookup
Islookup
A FTP(File Transfer Protocol) can be.
Active
Passive
Both
Which of the following are needed for Web browsers to find Web servers?
DHCP servers
DNS servers
WINS servers
All of them
The DHCP server
maintains the information about client configuration parameters
grants a IP address when receives a request from a client
maintains a database of available IP addresses
All of them
What does DHCP provides for a host?
IP address
MAC address
URL
Nothing
Which of this is a difference between static and dynamic routing?
Dynamic routing is used by a DNS server
Static routing is used in large networks
Dynamic routes are added automatically
Static routes are added automatically
The communication between DHCP client and servers on the same subnet it is made using.
UDP broadcast
UDP unicast
TCP broadcast
TCP unicast
What Address Resolution Protocol (ARP) does?
List all configured interfaces on a system
Physical address is found for a given logical address
To convert ethernet addresses to IP addresses
None of this
What protocol is used to automatically assign IP addresses to hosts?
DHCP
NAT
ARP
DNS
TCP sliding windows are oriented to.
Packet
Segment
Byte
None of this
For flow control, TCP uses a ……. window protocol.
limited-size
fixed-size
sliding
None of this
Where should you use a crossover cable?
To connect two PCs together directly
To connect a PC to a switch
To connect a router to a hub
To connect a PC to a hub
Where should you use a straight through cable?
To connect a PC to a router
To connect a switch to a hub
To connect a router to a hub
To connect two hubs together
A dynamic routing table.
Is updated automatically
Makes decisions on the best path
Is created by a routing protocol
All of them
A static routing table.
It can’t be changed
Is update manually
Always has the best path
All of them
Which of this is something that the default gateway does?
Passes traffic from the local subnet to devices on other subnets
It identifies the local subnet and formulates a routing table
Keeps all the IDs of others subnets
All of this
When can a dhcp server relay IP addresses to clients on a network segment separated from the server's location?
DHCP server can only relay IP addresses to the clients found on the same network segment
when the router separating them acts as a relay agent
when the dhcp server uses the same IP address as the router that supports the network segment where the clients are located
when there are more logical routes between the dhcp server and the subnetwork clients
Choose the correct use of the Straight through and the Cross over cable
cross cable to connect a PC to a PC and straight through to connect a switch to a hub
cross cable to connect a router to a PC and straight through to connect a switch to a server
cross cable to connect a switch to a hub and straight through to connect a router to a switch
cross cable to connect a switch to a switch and straight through to connect a hub to a switch
Choose the correct use of the following cables:
straight through to connect a hub to a switch or a hub to a PC
cross cable to connect a PC to a server or a PC to a router
straight through to connect a PC to a PC or a switch to a router
cross cable to connect a router to a router or a hub to a switch
In what situation is a PC unable to ping another PC?
PCs are on two different network segments on the same network
firewall is disabled on both of the PCs
one of the PCs is connected to the router by cross over cable
firewall is enabled on both computers
Which of the following is not a characteristic of the IP protocol?
It affects packet routing
Is considered an unreliable protocol
Is a connection-oriented protocol
It defines the Internet addressing system
Having more than one DHCP server on the same subnet of a network is :
possible , if all server besides one are offline , so that the client requests for IP addresses only reach that server
possible, as long as they share the same address pool to give to the clients
possible only if each of them has a different pool of addresses, without sharing any address
not possible
What is the main function of DNS?
maps a known IP address to a MAC layer address
provides host names to TCP/IP address resolution
automatically assigns IP addresses to the devices across the network
provides network connectivity to a computer
Gateways are used for:
providing connectivity between two or more network segments
providing network connectivity to a computer
tracing the route taken by data from the router to the destination network
transfer files between different platforms
What is the maximum number of hosts for a class C network?
65.534
65.535
128
254
What is the maximum number of networks in a class A network ?
126
128
16.384
254
Which one of the following addresses is a public IP address ?
10.0.0.0/8
207.46.130.0/24
172.16.0.0/12
1.0.0.0/8
NAT is
a connection between computers and other network devices that are located within a small physical location
a protocol providing a way for multiple computers on a common network to share single connection to the Internet
a protocol used by routers to send data from one network to another
a set of protocol layers designed to make data exchange possible on different types of computer networks
Which one is not true about classless routing protocols:
RIPv1 supports classless routing protocols
RIPv2 supports classless routing protocols
It is allowed to a use a variable length mask
It is allowed to use discontiguous network
Which one of these is a RIPv2 characteristic ?
maintains a routing table as in RIPv1 without the mask information
is a classful routing protocol
supports maximum metric(hop count) value up to 15 . Any router further than 15 hops is considered unreachable
does not support triggered updates or authentication of ripv2 update messages
Which one is true about RIPv1?
It is easier to configure than RIPv2
It maintains a routing table as in RIPv2 , including mask information
It has a lower administrative distance than RIPv2
It has the same timers as RIPv2
An IP address is:
64 bits
32 bytes
128 bytes
32 bits
Which of the following are valid IP addresses to mark a sub network ?
177.91.107.144/29
177.91.107.0/32
177.91.107.1/25
177.91.154/30
What is the range of network IPs in which the following given IP resides :194.168.19.65/28 ?
194.168.19.64 – 194.168.19.87
194.168.19.64 – 194.168.19.79
194.167.19.62 – 194 .167.19.87
194.168.19.0 - 194.168.19.64
Which of the following is the correct host range for the subnet in which we can find the IP address 192.168.168.188 255.255.255.192 ?
192.168.168.129-191
192.168.168.128-190
192.168.168.128-192
192.168.168.129-190
Which protocol does DHCP use at the Transport Layer ?
IP
UDP
TCP
ARP
Which class of IP address has the most host addresses available by default?
A
B
C
A and C
Which protocol does Ping use?
TCP
ARP
ICMP
IP
Which of the following does not use TCP?
HTTP
DHCP
FTP
SMTP
Which of the following is a private IP address ?
12.0.0.2
168.172.19.40
172.15.14.36
192.168.24.43
Which class of IP address provides a maximum of only 254 host addresses per network ID?
class A
class B
class C
class B and C
Which one is true about ICMP packets ?
They are encapsulated within IP datagrams.
ICMP is encapsulated within UDP datagrams.
They do not provide hosts with information about network problems.
They guarantee datagram delivery.
Which of the following is considered to be the destination host before translation?
Inside local host
Outside local host
Inside global host
Outside global host
Which of the following is considered to be the address after translation?
Inside local host
Outside local host
Inside global host
Outside global host
Which of the following is not a way to configure NAT ?
IP NAT pool
Static
Dynamic
NAT overload
Which one of the following is not an advantage of using NAT?
Conserves legally registered addresses
Translation introduces switching path delays
Increases flexibility when connecting to the Internet
Reduces address overlap occurrence
Which one is true about NAT ?
Causes loss of end-to-end IP traceability
Does not conserve legally registered addresses
Decreases flexibility when connecting to the Internet and certain applications will not function with NAT enabled
Increases address overlap occurrence
Which of the following is true about the IP address 10.16.3.65/23?
The subnet address is 10.16.3.0 255.255.254.0
The last valid host address in the subnet is 10.16.2.254 255.255.254.0
The broadcast address of the subnet is 10.16.3.0 255.255.254.0
The lowest host address in the subnet is 10.16.2.1 255.255.254.0
Which of the following are valid subnet addresses ?
177.91.107.0 ,177.92.107.97, 177.92.107.144
177.91.107.0 , 1.0.0.0 , 0.0.0.0
191.91.168.1 , 177.91.107.152, 177.91.168.127
177.91.107.0 , 177.91.107.144, 1.0.0.112
What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
14
15
16
30
What does a mask /28 mean?
the maximum number of IP addresses that can be assigned to hosts is 16
the maximum number of IP addresses that can be assigned to hosts is 14
the maximum number of IP addresses that can be assigned to hosts is 8
the maximum number of IP addresses that can be assigned to hosts is 30
A submask /30 can be given to:
a subnet with 3 PC’s, connected to a router by a switch
a subnet with 2 PC’s and a Server , connected to a router by a switch
a subnet with 2 PC’s connected directly to the
a subnet with 2 routers connected
You need to subnet a network that has 7 subnets, each with at least 16 hosts. Which classful subnet mask would you use?
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.252
You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?
6
7
8
14
The network address of 172.16.0.0/19 provides how many subnets and hosts?
7 subnets, 30 hosts each
8 subnets, 8,190 hosts each
8 subnets, 2,046 hosts each
7 subnets, 2,046 hosts each
Choose which protocols are at the transport layer:
IP
UDP
Ethernet
HTTP
Does OSI stand for Open Systems Interconnection?
True
False
A host can implement both sides of a client-server service. Meaning both client and server.
True
False
Do usually switches use IP addresses?
True
False
We use send() and recv() when using datagrams (UDP)
True
False
When a router receives a packet, it looks at the MAC addresses to determine the path the packet should take. A standard switch looks at the Network layer source and destination addresses to determine the path.
True
False
In both UDP and TCP you must use listen()
True
False
Ping uses ICMP from the Network Layer.
True
False
A host can only implement one side of the client-server service, meaning the client or the server.
True
False
An IPv4 address is 32 bytes long, represented in as 4 bytes in decimal separated by ".".
True
False
A switch always sends all incoming packets to all MAC addresses it is connected to.
True
False
When client closes a socket the client end system sends TCP FIN control segment to server. After that the server receives FIN and replies with ACK. Does the server send anything else?
Yes
No
Only one of the client or the server has to bind to the socket.
True
False
A UDP header contains: (source IP address, source Port number, destination Port number, Destination IP address)
True
False
A UDP source port number is represented on 32 bits.
True
False
UDP provides the following services:
Process-to-process delivery
Reliable data transfer
Error-checking
Congestion Control
Multiplexing is when the incoming data to a host is directed to the host's appropriate socket.
True
False
A TCP socket is identified by (source IP address, source Port number, destination Port number, Destination IP address)
True
False
A UDP socket is identified by IP address + Port number.
True
False
A socket is an interface between the Application Layer and the Transport Layer.
True
False
IP(Internet Protocol) is a best-effort delivery service which means it is reliable.
True
False
Which of the following affirmations about UDP is not true ?
Writes packets of bytes
No read bytes from a packet are lost
Neither party can overflow the other. Traffic is controlled by the OS
Not read bytes from a packet are lost
Which one is not a principle to the OSI model?
A layer should be created where a different abstraction is needed.
Each layer should perform a well-defined function.
The layer boundaries should be chosen to maximize the information flow across the interfaces.
The function of each layer should be chosen with an eye toward defining internationally standardized protocols.
Which of the following layers, controls the operation of a subnet and handles how packets are routed from source to destination ?
The Network Layer
The Transport Layer
The Session Layer
The Presentation Layer
Which protocol handles mail exchange?
FTP
Telnet
SSH
SMTP
Which one of the following is a Natural Mask?
255.255.255.255
255.255.255.0
255.255.255.128
255.255.255.64
IP - best effort protocol - does its best effort to transfort datagram from one machine to another with no guarantee of an
Successful delivery
Duplication/Unicity
Data integrity
All of the above
Which affirmation is not true about The Network Address Translation:
No need to be allocated range of addresses from ISP:- just one IP address is used for all devices
Can change addresses of devices in local network without notifying outside world
Can change ISP only by changing addresses of devices in local network
Devices inside local net not explicitly addressable, visible by outside world
Which of the following affirmations about TCP is not true?
Client process must first be running
Server must have created socket that welcomes client’s contact
Allows server to talk with multiple clients
Source port numbers are used to distinguish clients
IP Routing is based on the:
Source IP
Destination IP
Network Address
Broadcast Address
Which is not a Service of a Data Link Layer?
Framing and link access
Flow Control
Error Correction
Traffic isolation
What is TTL?
Time To Leave
Total Time Limit
Time To Live
Time Tracking Limit
Consider a network 60.20.30.0/24. Computers within the network have the default gateway 60.20.30.1, which is the ip of the router. The DNS server has the ip 60.20.30.2 and has the following entries in the DNS Table google.ro 120.30.4.5 mywebsite.ro 60.20.30.3 .A computer having the ip 60.20.30.4 opens the web browser and visits the website mywebsite.ro. What is the packet route through the network?
60.20.30.4 -> 60.20.30.1 -> 60.20.30.3 -> 60.20.30.1 -> 60.20.30.3 -> 60.20.30.2 -> 60.20.30.4
60.20.30.4 -> 60.20.30.2 -> 60.20.30.1 -> 60.20.30.3 -> 60.20.30.4 -> 60.20.30.2 -> 60.20.30.4
60.20.30.4 -> 60.20.30.1 -> 60.20.30.2 -> 60.20.30.3 -> 60.20.30.1 -> 60.20.30.4
60.20.30.4 -> 60.20.30.1 -> 60.20.30.2 -> 60.20.30.1 -> 60.20.30.4 -> 60.20.30.1 -> 60.20.30.3 -> 60.20.30.1 -> 60.20.30.4
What are the protocols involved in sending an email?
FTP
SMTP
TCP
POP3
HTTP
TCP stands for...
Transfer Control Protocol
Transmission Connection Protocol
Transformation Central Protocol
Transmission Control Protocol
What is a datagram?
A structure used to get data from the user in order to synchronize the server
A basic transfer unit used in packet-switched networks, providing a connectionless comunnication service
Information that can harm your computer if you're not careful with it
Millions of bytes configured in a big cluster which can be easily transferred
ARP can be used for...
Mapping network addresses to physical (MAC) addresses
Mapping public virtual addresses to private ip addresses
Publishing websites to the internet
Sending emails very fast
TCP, UDP and SCTP are part of
Application Layer
Internet Layer
Transport Layer
Link Layer
TCP Header contains the following entries:
Source Port, Destination Port, Sequence Number, Acknowledgement Number, Flags, Data Offset, Checksum, Urgent Pointer
Source IP, Destination IP, Pointer to MAC address, Connection unique identifier, Router IP, NAT tables
Source Port, Destination Port, Length, Checksum
Source Mac, Destination Mac, Connection object, Checksum, Data hash
What would be a network security recommandation?
Forwarding all traffic from the router ports to computer ports
Activate firewall and use good firewall rules
Use the default router password, everybody will expect that you change it, so not changing it is a good strategy
Allow RDP connections on your computers
What is DSL and what it is used for?
Digital Subscriber Line; used to give access to internet through telephone lines
Digital Supplier Limit; verifies if the maximum connected users in a wi-fi network has been reached
Describer Serial Link; used for serial cables to assure their connectivity in a network
Destination Source Limit; limits the number of packets sent and received, used for security reasons
What is the difference between a switch and a hub?
The hub sends a packet specifically to an end point or more, the switch broadcasts the message to all the network
The switch sends a packet specifically to an end point or more, the hub broadcasts the message to all the network
The hub can send packets on large distances, but the switch is generally for home usage
There is no difference
The last address of IP address represents?
Broadcast
Network
Unicast address
Multicast
Which of the following IP addresses class is multicast?
Class A
Class B
Class C
Class D
Which of the following is correct regarding Class B address of IP address
Network 18 , Host 16
Network 14 , Host 16
Network 16 , Host 14
Network 12 , Host 14
How many layers are in TCP/IP ?
7
4
6
5
IPv4 Address is
64 bit
16 bit
48 bit
32 bit
DNS is the abreviation for
Dynamic Network System
Domain Name System
Domain Network Server
Dynamic Name System
What is the size of a MAC address?
16 bits
32 bits
48 bits
64 bits
MAC address is the example of?
Transport layer
Data link layer
Application layer
Physical layer
For error detection in TCP/IP we use?
Bit sum
Check sum
Error Flag
Error bit
The mount of data that can be carried in a given time is called?
Capacity
Scope
Bandwith
Limitation
What is the size of Host in Class B of an IP address?
4
8
16
32
What is the use of the ping command?
To test if your connection is wired or wireless
To test a device on the network is reachable
To get your MAC address
To get your IP address
What is a normal mask for a Class C network?
255.255.255.1
255.255.255.128
255.255.0.0
255.255.255.0
What does a protocol defines?
What data is communicated
How data is communicated
When data is communicated
None of the above
What is the use of Subnetting?
It divides one network into several smaller networks
It divides a network into network classes
It speeds upthe network
All of the above
The ............. provides a connection oriented reliable service for sending data.
TCP
UDP
Which of the following describes 'big endian'?
most significant byte first
most significant byte last
least significant byte in the middle
most significant byte in the middle
None of the above
Which of the following describes 'little endian'?
least significant byte first
least significant byte last
least significant byte in the middle
most significant byte in the middle
None of the above
What is the in-memory representation of 56E2 in little endian?
56E2
E256
2E65
652E
What is the in-memory representation of 56E2 in big endian?
56E2
E256
2E65
652E
How many bytes does 'double' use?
1 byte
4 bytes
8 bytes
16 bytes
How many bytes does 'float' use?
1 byte
4 bytes
8 bytes
16 bytes
What does TCP/IP stand for?
Transport Control Protocol/Internet Protocol
Transmission Check Protocol/Internet Protocol
Transmission Control Protocol/Inverse Protocol
Transmission Control Protocol/Internet Protocol
What type of connection does SOCK_STREAM indicate?
TCP connection
UDP connection
Closed connection
Open connection
What type of connection does SOCK_DGRAM indicate?
TCP connection
UDP connection
Closed connection
Open connection
What does UDP stand for?
User Defined Protocol
User Datalink Protocol
User Datagram Protocol
Utility Datagram Protocol
What does DNS stand for
Dynamic Name Server
Dynamic Name System
Domain Name Server
Domain Name System
How many different network layers are there (according to the OSI Reference Model)?
7
4
5
9
The 4 bottom network layer (according to the OSI Refererence Model), in order, are the following:
Physical, Data link, Network, Transport
Physical, Network, Data link, Transport
Physical, Data link, Transport, Network
Data link, Physical, Network, Transport
What does FTP stand for?
File Transmission Protocol
File Transfer Protocol
File Translocation Protocol
Folder Transmission Protocol
How can we refer to a Internet-connected machine?
by its IP Address
by its host name
by its domain name
The natural mask of the Class B is:
255.0.0.0
255.255.255.0
255.255.0.0
class B does not have a natural mask
The total addresses in class D is:
2^28
2^29
2^30
is not defined
What statement about NAT is false?
can change addresses of devices in local network without notifying outside world
can change ISP without changing addresses of devices in local network
is not controversial
What does HTTP use as its underlying transport protocol?
TCP
UDP
What statement about FTP is false?
it runs exclusively over TCP
it uses a separate connection for control and data.
FTP sessions work only in passive modes
MAC addresses are 6-byte in length.
True
False
PPP does not permit multiple network layer protocols to operate on the same communication link.
True
False
UDP requires three packets to set up a socket connection, before any user data can be sent
True
False
ICMP is a transport protocol that sends data between systems.
True
False
What is a property of a computer network?
all components are linked to a router.
all components are interconnected.
all components are linked using a coaxial cable.
it has only PCs and workstations.
Which of the following is NOT a computer network?
The Internet.
Worldwide telephone system.
A PC connected to headphones.
Telephone system.
If AB12 is represented in big endian as AB12, what is its representation in little endian?
21BA
12BA
BA21
12AB
What function call you don't find in an UDP server?
recvfrom
bind
sendto
accept
What happens with the bytes that are not read by a TCP server?
Are lost forever.
Are sent back to source.
Stay avalaible for next read.
Are transfered to a special location in the network.
Which of the following is NOT a valid IP netmask combination?
168.220.186.8/225.255.225.252.
156.198.186.8/255.255.255.254.
209.198.186.8/255.255.255.246.
168.220.186.64/255.255.255.240.
When you have an ip address and the network mask what operation you need to do in order to find out the network address?
or between ip and netmask.
and between ip and netmask.
divide the ip by the mask.
you can't find the network address.
Which of the following is NOT a valid IP netmask combination?
168.220.186.8/225.255.225.252.
156.198.186.16/255.255.255.254.
209.198.186.8/255.255.255.248.
168.220.186.8/255.255.255.240.
Which of the following is a class C IP address?
10.10.14.118
135.23.112.57
191.200.199.199
204.67.118.54
UDP packets are encapsulated in:
en Ethernet frame
a TCP segment
an IP diagram
none of the above
Which of the following functions does UDP perform?
process to process communication
improve the data transfer rate of large files (compared to TCP)
assure that the sent messages arrive in the order that have been sent
protect the data sent against any corruption while transferring it.
Which of the following is not an application layer protocol?
HTTP
IMAP
SMTP
TCP
A one-to- all communication between one source and all hosts on a network can be classified as:
unicast communication
broadcast communication
multicast communication
anycast communication
The data link layer takes packets from ….. and encapsulated them into frames for transmission
network layer
physical layer
transport layer
application layer
FTP uses the following channels:
the delta channel
the control channel
the bearer channel
the data channel
Which can be an Ethernet physical address?
07:01:02:01:2C:4B
07:01:02:01:2C:4B:2C
07:02:01:2C:4B
none of the above
The underlying transport layer protocol used by SMTP:
TCP
UDP
both TCP and UDP
none of the above
In HTTP Protocol, a client can directly connect to a server using:
Web
Domain
Telnet
HTTP
Each ip must contain
Only destination address
Source and destination address
Only source address
None of above
Broadcasting is
When a transmitted packet is received and processed by every machine on the network
When a transmitted packet is received by every machine on the network but processed by only one of them
When a transmitted packet is received by every machine on the network but processed by none of them
A mechanism which is used when the transmission of a packet fails
A collection of interconnected networks is called as
WAN
INTRANET
TOPOLOGY
INTERNET
The hexa number FA23 in little endian is
23FA
32AF
FA23
23AF
The hexa number FA23 in big endian is
23FA
32AF
FA23
23AF
Choose the false statement
TCP writes stream of bytes
TCP reads bytes from a packet
UDP reads bytes from a packet
Using UDP protocols packets can be lost
Consider one HUB and 10 PC's connected to it
when PC1 sends a message to PC5, the message will be received by all the PC's but only PC5 process it; the answer will be also received by all the PC's but only PC1 will process it
when PC1 sends a message to PC5, the message will be received and processed just by PC5 and the answer of PC5 will be received and processed just by PC1
when PC1 sends a message to PC5, the message will be received by all the PC's, each of them sending back an answer
when PC1 sends a message to PC5, the message will be received by all the PC's, but only PC5 process it; the answer is sent back and received only by PC1
The following system calls are/is optional at the level of a TCP client:
socket()
listen()
bind()
connect()
Which one/ones of the following addresses have to be identical for all computers located in the same local network(from a physical and logic point of view)
Network address
Broadcast address
IP address
MAC address
The ARP protocol helps with:
Determining the IP address when the MAC address is known
Determining the MAC address when the IP address is known
Determining the IP address when the DNS server is known
DHCP is a client/server protocol that automatically provides an Internet Protocol host with its:
IP address
Subnet mask
MAC address
Default gateway
The natural mask for a class A address is :
255.255.255.0
255.226.255.0
255.0.0.0
255.255.0.0
Consider the following netmask: 255.255.0.0, the network part(network length) is formed by a number of bits equal to:
24
16
8
Impossible to determine
What is a private IP address?
It's an IP address that does not have a netmask
It's an IP address that is reserved for internal use behind a router or NAT device, apart from the public
It's an IP address that your device receives when connecting to public networks
It's an IP address that has the following form: 127.0.x.x
Which is the range for an IP address of class B
191-220
127-190
128-191
128-192
What is the broadcast address of the following IP address 221.17.123.9 that has in its network 42 computers?
221.17.123.255
255.255.255.255
221.17.123.64
221.17.123.65
What is the use of the ARP protocol?
To determine the IP address when we know the MAC address
To determine the MAC address when we know the IP address
To determine the IP address when we know the IP address of the DNS server
To determine the MAC address when we know the default gateway
What does UDP stand for?
User Datagram Protocol
Universal Datagram Packets
Unique Destination Protocol
Undefined Destination Packets
What is the subdomain for the top level domain for the following DNS address: "linux.scs.ubbcluj.ro"?
linux
scs
ubbcluj
ro
Which is the difference between bandwidth and throughput?
The bandwidth is the physical property of the transmission medium, while throughput represents the amount of data which we transmit
There is no difference between them
The bandwidth represents the amount of data which we transmit, while throughput is the physical property of the transmission medium
What is a broadcast MAC address?
It's a logical address which identifies only one recipient
It's a logical address which is used to identify all the computers within a network
It's a logical identifier for a group of hosts in a computer network that are available to process data-grams
In how many subclasses with the netmask 255.192.0.0 can the class of minimal dimension containing both IP addresses: 78.79.80.81 and 79.80.81.82, be divided?
7
10
8
9
Which are the layers of the TCP/IP model?
Application layer, transport layer, session layer, network access layer
Application layer, transport layer, internet layer, network access layer
Application layer, presentation layer, session layer, transport layer, network layer, data-link layer, physical layer
Application layer, internet layer
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