CCNA4 Chapter 5 Exam
Mastering NAT Concepts in Networking
Test your knowledge of Network Address Translation (NAT) with this extensive quiz designed for networking enthusiasts and professionals! This quiz covers key concepts, practical applications, and challenges associated with NAT.
Are you ready to challenge yourself? Take the quiz and discover:
- How well you understand NAT technologies
- Common pitfalls and configurations
- Real-world applications of NAT in networking
Typically, which network device would be used to perform NAT for a corporate environment?
DHCP server
Host device
Router
Server
Switch
When NAT is employed in a small office, which address type is typically used for hosts on the local LAN?
Private IP addresses
Global public IP addresses
Internet-routable addresses
Both private and public IP addresses
Which version of NAT allows many hosts inside a private network to simultaneously use a single inside global address for connecting to the Internet?
PAT
Static NAT
Dynamic NAT
Port forwarding
Which type of NAT maps a single inside local address to a single inside global address?
Dynamic
Static
Port address translation
Overloading
What is a disadvantage of NAT?
There is no end-to-end addressing.
The router does not need to alter the checksum of the IPv4 packets.
The internal hosts have to use a single public IPv4 address for external communication.
The costs of readdressing hosts can be significant for a publicly addressed network.
How does NAT complicate the use of IPsec?
End-to-end IPv4 traceability is lost.
Troubleshooting is made impossible.
Network performance is degraded even more than with just NAT.
Header values are modified which causes issues with integrity checks.
Refer to the exhibit. R1 is configured for NAT as displayed. What is wrong with the configuration?
Access-list 1 is misconfigured.
NAT-POOL2 is not bound to ACL 1.
Interface Fa0/0 should be identified as an outside NAT interface.
The NAT pool is incorrect.
Which statement accurately describes dynamic NAT?
It always maps a private IP address to a public IP address.
It provides an automated mapping of inside local to inside global IP addresses.
It provides a mapping of internal host names to IP addresses.
It dynamically provides IP addressing to internal hosts.
A network administrator configures the border router with the command R1(config)# ip nat inside source list 4 pool corp. What is required to be configured in order for this particular command to be functional?
A NAT pool named corp that defines the starting and ending public IP addresses
An access list named corp that defines the private addresses that are affected by NAT
An access list numbered 4 that defines the starting and ending public IP addresses
Ip nat outside to be enabled on the interface that connects to the LAN affected by the NAT
A VLAN named corp to be enabled and active and routed by R1
When dynamic NAT without overloading is being used, what happens if seven users attempt to access a public server on the Internet when only six addresses are available in the NAT pool?
No users can access the server.
The request to the server for the seventh user fails.
All users can access the server.
The first user gets disconnected when the seventh user makes the request.
Refer to the exhibit. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco broadband router?
Defines which addresses can be translated
Defines which addresses are allowed into the router
Defines which addresses are assigned to a NAT pool
Defines which addresses are allowed out of the router
What is the purpose of port forwarding?
Port forwarding allows an external user to reach a service on a private IPv4 address that is located inside a LAN.
Port forwarding allows users to reach servers on the Internet that are not using standard port numbers.
Port forwarding allows an internal user to reach a service on a public IPv4 address that is located outside a LAN.
Port forwarding allows for translating inside local IP addresses to outside local addresses.
What is a characteristic of unique local addresses?
They allow sites to be combined without creating any address conflicts.
They are designed to improve the security of IPv6 networks.
Their implementation depends on ISPs providing the service.
They are defined in RFC 3927.
Which prefix is used for IPv6 ULAs?
2001:7F8::/29
2001:DB8:1:2::/64
FC00::/7
FF02::1:FF00:0/104
Which technology would be used on a router that is running both IPv4 and IPv6?
Dual stack
NAT for IPv6
Static NAT
Dynamic NAT
Refer to the exhibit. Based on the output that is shown, what type of NAT has been implemented?
Dynamic NAT with a pool of two public IP addresses
PAT using an external interface
Static NAT with one entry
Static NAT with a NAT pool
Refer to the exhibit. The NAT configuration applied to the router is as follows: ERtr(config)# access-list 1 permit 10.0.0.0 0.255.255.255 ERtr(config)# ip nat pool corp 209.165.201.6 209.165.201.30 netmask 255.255.255.224 ERtr(config)# ip nat inside source list 1 pool corp overload ERtr(config)# ip nat inside source static 10.10.10.55 209.165.201.4 ERtr(config)# interface gigabitethernet 0/0 ERtr(config-if)# ip nat inside ERtr(config-if)# interface serial 0/0/0 ERtr(config-if)# ip nat outside Based on the configuration and the output shown, what can be determined about the NAT status within the organization?
NAT is working.
Static NAT is working, but dynamic NAT is not.
Dynamic NAT is working, but static NAT is not.
Not enough information is given to determine if both static and dynamic NAT are working.
Which configuration would be appropriate for a small business that has the public IP address of 209.165.200.225/30 assigned to the external interface on the router that connects to the Internet?
Access-list 1 permit 10.0.0.0 0.255.255.255 ip nat inside source list 1 interface serial 0/0/0 overload
Access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp
Access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp overload
Access-list 1 permit 10.0.0.0 0.255.255.255 ip nat pool comp 192.168.2.1 192.168.2.8 netmask 255.255.255.240 ip nat inside source list 1 pool comp overload ip nat inside source static 10.0.0.5 209.165.200.225
What are two of the required steps to configure PAT? (Choose two.)
Define a pool of global addresses to be used for overload translation.
Create a standard access list to define applications that should be translated.
Define the range of source ports to be used.
Identify the inside interface.
Define the hello and interval timers to match the adjacent neighbor router.
What is the group of public IPv4 addresses used on a NAT-enabled router known as?
Outside local addresses
Inside local addresses
Inside global addresses
Outside global addresses
Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. What problem is causing PC-A to be unable to communicate with the Internet?
The static route should not reference the interface, but the outside address instead.
This router should be configured to use static NAT instead of PAT.
The ip nat inside source command refers to the wrong interface.
The access list used in the NAT process is referencing the wrong subnet.
The NAT interfaces are not correctly assigned.
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