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Q:

Which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?

A) /28	B) /29
C) /30	D) /31

Answer & Explanation Answer: C) /30

Explanation:

A point-to-point link uses only two hosts. A/30, or 255.255.255.252, mask provides two hosts per subnet.

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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:

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 : $2^{8} - 2 = 256 - 2 = 254$

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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:

Which of the following is correct?

A) Full- duplex Ethernet uses one pair of wires	B) Full- duplex Ethernet uses two pairs of wires
C) Half- duplex Ethernet uses two pairs of wires	D) Full- duplex Ethernet uses three pairs of wires

Answer & Explanation Answer: B) Full- duplex Ethernet uses two pairs of wires

Explanation:

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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

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