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Q:

Which of the following protocols uses both TCP and UDP?

A) FTP B) SMTP
C) Telnet D) DNS
 
Answer & Explanation Answer: D) DNS

Explanation:

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

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Q:

What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

A) Application B) Host-to-Host
C) Internet D) Network Access
 
Answer & Explanation Answer: B) Host-to-Host

Explanation:

The four layers of the TCP/IP stack (also called the DoD model) are Application/process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

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Q:

The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?

A) Application B) Host-to-Host
C) Internet D) Network Access
 
Answer & Explanation Answer: C) Internet

Explanation:

The four layers of the DoD model are Application/process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.

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Q:

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 & Explanation Answer: C) Proxy ARP

Explanation:

Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.

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Q:

Which class of IP address provides a maximum of only 254 host addresses per network ID?

A) Class A B) Class B
C) Class C D) Class D
 
Answer & Explanation Answer: C) Class C

Explanation:

Class C network address has only 8 bits for defining hosts : 28-2 = 256 - 2 = 254

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Q:

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

A) 01xxxxxx B) 0xxxxxxx
C) 10xxxxxx D) 110xxxxx
 
Answer & Explanation Answer: C) 10xxxxxx

Explanation:

The range of a  Class B network address is 128 - 191. This makes our binary range 10xxxxxx.

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Q:

What must happen if a DHCP IP conflict occurs?

A) Proxy ARP will fix the issue B) The client uses a gratuitous ARP to fix the issue
C) The administrator must fix the conflict by hand at the DHCP server D) The DHCP server will reassign new IP addresses to both computers
 
Answer & Explanation Answer: C) The administrator must fix the conflict by hand at the DHCP server

Explanation:

If a DHCP Conflict is detected, either by the server sending a ping and getting response or by a host using a gratuitous ARP (arp'ing for its own IP address and seeing if a host responds), then the server will hold that address and not use it again until it is fixed by an administrator.

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Q:

How does DHCP client ensure that no other computer has its assigned IP address?

A) Acknowledge receipt of a TCP segment B) Ping to its own address to see if a response is detected
C) Broadcast a Proxy ARP D) Broadcast a gratuitous ARP
 
Answer & Explanation Answer: D) Broadcast a gratuitous ARP

Explanation:

To stop possible address conflicts , a DHCP client will use gratuitous ARP (broadcast an ARP request for its own IP address) to see if another host responds.

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Filed Under: CCNA