Part 1 Review

The process of HTTP asking TCP to send some data and making sure that it is received correctly is an example of what?

Same-layer interaction

Adjacent-layer interaction

OSI Model

All of these answers are correct

The process of TCP on one computer marking a TCP segment as a segment 1, and the receiving computer then acknowledging the receipt of TCP segment 1 is an example of what?

The process of a web server adding a TCP header to the contents of a web page, followed by adding an IP header and then adding a data link header and trailer, is an example of what?

Data encapsulation

Same-layer interaction

OSI Model

All of these answers are correct

Which of the following terms is used specifically to identify the entity created when encapsulating data inside data link layer headers and trailers?

In the LAN for a small office, some user devices connect to the LAN using a cable, while others connect using wireless technology (and no cable). Which of the following is true regarding the use of Ethernet in this LAN?

Only the devices that use cables are using Ethernet

Only the devices that use wireless are using Ethernet

Both the devices using cables and those using wireless are using Ethernet

None of the devices are using Ethernet

Which of the following is true about Ethernet crossover cables for Fast Ethernet?

Pins 1 and 2 are reversed on the other end of the cable

Pins 1 and 2 on one end of the cable connect to pins 3 and 6 on the other end of the cable

Pins 1 and 2 on one end of the cable connect to pins 3 and 4 on the other end of the cable

The cable can be up to 1000 meters long to cross over between buildings

None of the other answers is correct

Each answer list two types of devices used in a 100BASE-T network. If these devices were connected with UTP Ethernet cables, which pairs of devices would require a straight-through cable? (Choose Three)

Which of the following is true about the CSMA/CD algorithm?

The algorithm never allows collisions to occur

Collisions can happen, but the algorithm defines how the computers should notice a collision and how to recover.

The algorithm works with only two devices on the same Ethernet

None of the other answers are correct

Which of the following are correct about the Ethernet FCS field?

Ethernet uses FCS for error recovery

It is 2 bytes long

It resides in the Ethernet trailer, not the Ethernet header

It is used for encryption

Which of the following are true about the format of Ethernet addresses? (Choose Three)

Each manufacturer puts a unique OUI code into the first 2 bytes of the address

Each manufacturer puts a unique OUI code into the first 3 bytes of the address

Each manufacturer puts a unique OUI code into the first half of the address

The part of the address that holds this manufacturer's code is called the MAC

The part of the address that holds this manufacturer's code is called the OUI

The part of the address that holds this manufacturer's code has no specific name

Which of the following terms describe Ethernet addresses that can be used to send one frame that is delivered to multiple devices on the LAN? (Choose Two)

Burned-in address

Unicast address

Broadcast address

Multicast address

Which of the following best describes the main function of OSI Layer 1 as used in WANS?

Framing

Delivery of bits from one device to another

Addressing

Error detection

In the cabling for a leased line, which of the following typically connects to a frame wire line provided by a telco?

Router serial interface without internal CSU/DSU

CSU/DSU

Router serial interface with internal transceiver

Switch serial interface

Two routers, R1 and R2, connect using an Ethernet over MPLS service. The service provides point-to-point service between these two routers only, as a Layer 2 Ethernet service. Which of the following are the most likely to be true about this WAN? (Choose Two)

R1 will connect to a physical Ethernet link, with the other end of the cable connected to R2

R1 will connect to a physical Ethernet link, with the other end of the cable connected to a device at the WAN service point of presence

R1 will forward data link frames to R2 using an HDLC header/trailer

R1 will forward data link frames to R2 using an Ethernet header/trailer

Which of the following Internet access technologies, used to connect a site to an ISP, offers asymmetric speeds? (Choose Two)

Leased lines

DSL

Cable Internet

BGP

Fred has just added DSL service at his home, with a separate DSL modem and consumer-grade router with four Ethernet ports. Fred wants to use the same old phone he was using before the installation of DSL. Which is most likely true about the phone cabling and phone used with his new DSL installation?

He uses the old phone, cabled to one of the router/switch device's Ethernet ports

He uses the old phone, cabled to the DSL modem's port

He uses the old phone, cabled to an existing telephone port, and not to any new device

The old phone must be replaced with a digital phone

Imagine that PC1 needs to send some data to PC2, and PC1 and PC2 are separated by several routers. Both PC1 and PC2 sit on different Ethernet LANs. What are the largest entities (in size) that make it from PC1 to PC2? (Choose Two)

PC1 and PC2 are on two different Ethernet LANs that are separated by an IP router. PC1's IP address is 10.1.1.1, and no subnetting is used. Which of the following addresses could be used for PC2? (Choose Two)

Imagine a network with two routers that are connected with a point-to-point HDLC serial link. Each router has an Ethernet, with PC1 sharing the Ethernet with Router1 and PC2 sharing the Ethernet with Router2. When PC1 sends data to PC2, which of the following is true?

Router1 strips the Ethernet header and trailer off the frame received from PC1, never to be used again

Router1 encapsulates the Ethernet frame inside an HDLC header and sends the frame to Router2, which extracts the Ethernet frame for forwarding to PC2

Router1 Strips the Ethernet header and trailer off the frame received from PC1, which is exactly re-created by Router2 before forwarding data to PC2

Router1 removes the Ethernet, IP, and TCP headers and rebuilds the appropriate headers before forwarding the packet to Router2

Which of the following does a router normally use when making a decision about routing TCP/IP packets?

Which of the following are true about a LAN-connected TCP/IP host and its IP routing (forwarding) choices? (Choose Two)

The host always sends packets to its default gateway

The host sends packets to its default gateway if the destination IP address is in a different class of IP network than the host

The host sends packets to its default gateway if the destination IP address is in a different subnet as the host

The host sends packets to its default gateway is the destination IP address is in the same subnet as the host

Which of the following are functions of a routing protocol? (Choose Two)

Advertising known routes to neighbouring routes

Learning routes for subnets directly connected to the router

Learning routes, and putting those routers into routing table, for routers advertised to the router by its neighbouring routers

Forwarding IP packets based on a packet's destination IP address

A company implements a TCP/IP network, with PC1 sitting on an Ethernet LAN. Which of the following protocols and features requires PC1 to learn information from some other server device?

ARP

Ping

DNS

None of the other answers are correct

Which of the following is not a feature of a protocol that is considered to match OSI Layer 4?

Error recovery

Flow control

Segmenting of application data

Conversation from binary to ASCII

Which of the following header fields identify which TCP/IP application gets data received by the computer? (Choose Two)

What do you call data that includes the Layer 4 protocol header, and data given to Layer 4 by the upper layers, not including any headers and trailers from Layer 1 to 3? (Choose Two)

In the URL http://www.certskills.com/ICND1, which part identifies the web server?

When comparing VoIP with an HTTP-based mission-critical business application, which of the following statements are accurate about the quality of service needed from the network? (Choose Two)

VoIP needs better (lower) packet loss

HTTP needs less bandwidth

HTTP needs better (lower) jitter

VoIP needs better (lower) delay

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