TCP/IP Questions and Answers

Q: Which of the following services use UDP? 1.DHCP 2.SMTP 3.SNMP 4.FTP 5.HTTP 6.TFTP

Correct answer: 1, 3 and 6DHCP, SNMP and TFTP all use UDP. Each has a reason: DHCP must broadcast before the client has an address, SNMP sends small independent polls and traps where a lost one can simply be repeated, and TFTP handles its own acknowledgements. SMTP, FTP and HTTP all need the reliable ordered stream that TCP provides.

Q: What is the address range of a Class B network address in binary?

Correct answer: 10xxxxxxThe classes are distinguished by their leading bits: Class A begins with 0, Class B with 10, Class C with 110 and Class D with 1110. So a Class B address starts 10 in binary, which corresponds to a first octet of 128 to 191 in decimal - and reading it that way is a useful cross-check.

Q: Which of the following is private IP address?

Correct answer: 192.168.24.43The private ranges defined by RFC 1918 are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Only the last option falls in one. The trap is 172.15.14.36, which is outside the private block - that range begins at 172.16 and ends at 172.31, so 172.15 and 172.32 are both public.

Q: Which of the following allows a router to respond to an ARP request that is intended for a remote host?

Correct answer: Proxy ARPProxy ARP lets a router answer an ARP request on behalf of a host on another network, supplying its own MAC address so that the sender forwards the frame to the router, which then routes it onward. It exists for hosts that have no default gateway configured or that believe the whole address range is local. RARP and inverse ARP work in the opposite direction, resolving an address from a known hardware or circuit identifier.

71.

Which of the following services use UDP?

1.DHCP

2.SMTP

3.SNMP

4.FTP

5.HTTP

6.TFTP

A.1, 3 and 6
B.2 and 4
C.1, 2 and 4
D.All of the above

Answer: A

Correct answer: 1, 3 and 6

DHCP, SNMP and TFTP all use UDP. Each has a reason: DHCP must broadcast before the client has an address, SNMP sends small independent polls and traps where a lost one can simply be repeated, and TFTP handles its own acknowledgements. SMTP, FTP and HTTP all need the reliable ordered stream that TCP provides.

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72.

What is the address range of a Class B network address in binary?

A.01xxxxxx
B.0xxxxxxx
C.10xxxxxx
D.110xxxxx

Answer: C

Correct answer: 10xxxxxx

The classes are distinguished by their leading bits: Class A begins with 0, Class B with 10, Class C with 110 and Class D with 1110. So a Class B address starts 10 in binary, which corresponds to a first octet of 128 to 191 in decimal - and reading it that way is a useful cross-check.

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73.

Which of the following are layers in the TCP/IP model?

1.Application

2.Session

3.Transport

4.Internet

5.Data Link

6.Physical

A.1 and 2
B.1, 3 and 4
C.2, 3 and 5
D.3, 4 and 5

Answer: B

This seems like a hard question at first because it doesn't make sense. The listed answers are from the OSI model and the question asked about the TCP/IP protocol stack (DoD model). However, let's just look for what is wrong. First, the Session layer is not in the TCP/IP model; neither are the Data Link and Physical layers. This leaves us with the Transport layer (Host-to-Host in the DoD model), Internet layer (Network layer in the OSI), and Application layer (Application/Process in the DoD).

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74.

You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?

A.SMTP
B.SNMP
C.DHCP
D.ARP

Answer: C

Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is IP address, subnet mask, default gateway, and DNS information.

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75.

Which of the following is private IP address?

A.12.0.0.1
B.168.172.19.39
C.172.15.14.36
D.192.168.24.43

Answer: D

Correct answer: 192.168.24.43

The private ranges defined by RFC 1918 are 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. Only the last option falls in one. The trap is 172.15.14.36, which is outside the private block - that range begins at 172.16 and ends at 172.31, so 172.15 and 172.32 are both public.

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76.

Which of the following allows a router to respond to an ARP request that is intended for a remote host?

A.Gateway DP
B.Reverse ARP (RARP)
C.Proxy ARP
D.Inverse ARP (IARP)

Answer: C

Correct answer: Proxy ARP

Proxy ARP lets a router answer an ARP request on behalf of a host on another network, supplying its own MAC address so that the sender forwards the frame to the router, which then routes it onward. It exists for hosts that have no default gateway configured or that believe the whole address range is local. RARP and inverse ARP work in the opposite direction, resolving an address from a known hardware or circuit identifier.

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