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Q:

If a host on a network has the address 172.16.45.14/30, what is the subnetwork this host belongs to?

A) 172.16.45.0 B) 172.16.45.4
C) 172.16.45.8 D) 172.16.45.12
 
Answer & Explanation Answer: D) 172.16.45.12

Explanation:

A/30, regardless of the class of address, has a 252 in the fourth octet. This means we have a block size of 4 and our subnets are o,4,8,12,16, etc. Address 14 is obviously in the 12 subnet.

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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:

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:

In the operation of CSMA/CD, which host(s) have priority after the expiration of the backoff algorithm?

A) All hosts have equal priority B) The two hosts that caused the collision will have equal priority
C) The host that sent the jam signal after the collision D) The host with the highest MAC address
 
Answer & Explanation Answer: A) All hosts have equal priority

Explanation:

After the expiration of the backoff algorithm , all hosts have equal priority.

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Q:

You want to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?

A) Thicknet coax B) Thinnet coax
C) Category 5 UTP cable D) Fiber-optic cable
 
Answer & Explanation Answer: D) Fiber-optic cable

Explanation:

Fiber-optic cable provides a more secure, long - distance cable that is not susceptible to EMI interference at high speeds.

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Q:

Differentiate a MAC address and an IP address and describe how and when each address type is used in a network?

Answer

A MAC address is a hexadecimal number identifying the physical connection of a host. MAC addresses are said to operate on layer 2 of the OSI model. IP addresses, which can be expressed in binary or decimal format, are logical identifiers that are said to be on layer 3 of the OSI model. Hosts on the same physical segment locate one another with MAC addresses, while IP addresses are used when they reside on different LAN segments or subnets. Even when the hosts are in different subnets , a destination IP address will be converted to a MAC address when the packet reaches the destination network via routing.

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Q:

Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery?

Answer

The application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses)

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Subject: CCNA