CCNA Discovery 2 Chapter 4 V4.1 Answers

DsmbISP Chapter 4 – CCNA Discovery: Working at a Small-to-Medium Business or ISP (Version 4.1)

1. Which two statements describe classful IP addresses? (Choose two.)

It is possible to determine which class an address belongs to by reading the first bit.

The number of bits used to identify the hosts is fixed by the class of the network.

Only Class A addresses can be represented by high-order bits 100.

Up to 24 bits can make up the host portion of a Class C address.

Up to 24 bits can be used to identify unique networks.

Three of the five classes of addresses are reserved for multicasts and experimental use.


2. IPv6 increases the IP address size from 32 bits to how many bits?








3. In an 8 bit binary number, what is the total number of combinations of the eight bits?








4. Convert the decimal number 231 into its binary equivalent. Select the correct answer from the list below.








5. Which option shows the proper notation for an IPv6 address?






6. How many usable hosts are available given a Class C IP address with the default subnet mask?








7. What are two reasons that NAT was developed? (Choose two.)

to preserve registered public IP addresses

to allow users on the public Internet to access local networks

to provide a method for privately addressed LANs to participate in the Internet

to make routing protocols operate more efficiently

to allow private addresses to be routed on the public Internet

to reduce overhead and CPU usage on gateway routers


8. What must happen for a privately addressed host on an inside local network to be able to communicate with an outside destination host on the Internet?

The host IP address must be translated to an outside private address.

The host IP address must be translated to an inside local address.

The host IP address must be translated to an outside local address.

The host IP address must be translated to an inside global address.


9. Which port numbers are used by PAT to create unique global addresses?

255 and below

1024 and below

1025 and above

64,000 and above


10. Which IPv4 class of addresses provides the most networks?

Class A

Class B

Class C

Class D

Class E


11. What is the network broadcast address for a Class C address of with the default subnet mask?



CCNA Discovery 2 Chapter 4

Refer to the exhibit. Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configuration of the host is shown in the exhibit. What could be the cause of the problem?

The host subnet mask is incorrect.

The default gateway is a network address.

The default gateway is a broadcast address.

The default gateway is on a different subnet from the host.


13. Which statement accurately describes public IP addresses?

Public addresses cannot be used within a private network.

Public IP addresses must be unique across the entire Internet.

Public addresses can be duplicated only within a local network.

Public IP addresses are only required to be unique within the local network.

Network administrators are free to select any public addresses to use for network devices that access the Internet.


14. What is the range of the first octet in a Class B address?

127 to 191

127 to 192

128 to 191

128 to 192


15. Which IPv4 class provides the highest number of host addresses per network?

Class A

Class B

Class C

Class D

Class E



DsmbISP Chapter 4

Refer to the exhibit. Which range of IP addresses would allow hosts that are connected to the Router1 Fa0/0 interface to access outside networks? through through through through through


17. What are three advantages of NAT implementations? (Choose three.)

improved security

improved router performance

decreased processor load

improved scalability

universal application compatibility

sharing few public IP addresses with many hosts


18. Company XYZ uses a network address of It uses the mask of to create subnets. What is the maximum number of usable hosts in each subnet?






19. Which statement describes NAT overload or PAT?

Each internal address is dynamically translated to an individual external IP address.

A single internal address is always translated to the same unique external IP address.

Many internal addresses can be translated to a single IP address using different port assignments.

Many internal addresses are statically assigned a single IP address and port to use for communications.


20. Static NAT works by mapping a specific inside local IP address to what other specific address type?

inside global

outside local

outside global

private IP address

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