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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:

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:

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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Q:

If you use either Telnet or FTP, what layer are you using to generate the data?

A) Application B) Presentation
C) Session D) Transport
 
Answer & Explanation Answer: A) Application

Explanation:

Both FTP and Telnet use TCP at the Transport layer; however, they both are Application layer protocols, so the Application layer is the best answer for this question.

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Q:

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 & Explanation Answer: C) DHCP

Explanation:

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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Q:

Differentiate types of Ethernet cabling and identify their proper application?

Answer

The three types of cables that can be created from an Ethernet cable are straight-through (to connect a PC's or a router's Ethernet interface to a hub or switch), crossover (to connect hub to hub , hub to switch, switch to switch, or PC to PC), and rolled (for a console conection from a PC to a router or switch).

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Subject: CCNA

Q:

Identify the fields in the Data Link portion of an Ethernet frame?

Answer

The fields in the Data Link portion of a frame include the Preamble, Start Frame Delimiter, Destination MAC address, Source MAC address, Length or Type, Data, and Frame Check Sequence.

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Subject: CCNA