Q:

You want to ping the loopback address of your IPv6 local host. What will you type?

A) Ping 127.0.0.1 B) Ping 0.0.0.0
C) Ping ::1 D) trace 0.0. :: 1
 
Answer & Explanation Answer: C) Ping ::1

Explanation:

The loop back address with IPv4 is 127.0.0.1 . With IPv6, that address is ::1

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1 7291
Q:

Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?

A) HDLC B) Cable
C) VPN D) IPSec
 
Answer & Explanation Answer: C) VPN

Explanation:

A VPN allows or describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols. A VPN can be set up across any type of link.

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2 7258
Q:

What protocol would you use if you were running xDSL and needed authentication?

Answer

PPPoE  or  PPPoA

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4 6867
Q:

Which of the following descriptions about IPv6 is correct?

A) Addresses are not hierarchical and are assigned at random B) Broadcasts have been eliminated and replaced with multicasts
C) There are 2.7 billion addresses D) An interface can only be configured with one IPv6 address
 
Answer & Explanation Answer: B) Broadcasts have been eliminated and replaced with multicasts

Explanation:

There are no broadcasts with IPv6. Unicast , multicast, anycast, global, and link - local unicast are used.

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1 6739
Q:

What is the subnetwork address for a host with the IP address 200.10.5.68/28?

A) 200.10.5.56 B) 200.10.5.32
C) 200.10.5.64 D) 200.10.5.0
 
Answer & Explanation Answer: C) 200.10.5.64

Explanation:

This is a pretty simple question. A/28 is 255.255.255.240, which means that our block size is 16 in the fourth octent. 0,16, 32, 48, 64, 80, etc. The host is in the 64 subnet.

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1 6705
Q:

The router address 192.168.10.250 is the default gateway for both the Web Server 2 and Host 1. What is the correct subnet mask for this network?

A. 255.255.255.0
B. 255.255.255.192
C. 255.255.255.250
D. 255.255.255.252

Answer

Answer : A

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0 6670
Q:

A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?

A) Send a different source port number B) Restart the virtual circuit
C) Decrease the sequence number D) Decrease the window size
 
Answer & Explanation Answer: D) Decrease the window size

Explanation:

A receiving host can control the transmitter by using flow control ( TCP uses windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does  not overflow its buffers.

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0 6642
Q:

You have the following binary number :10110111. What are the decimal and hexadecimal equivalents?

A) 69/0x2102 B) 183/B7
C) 173/A6 D) 83/0xC5
 
Answer & Explanation Answer: B) 183/B7

Explanation:

You must be able to take a binary number and convert it into both decimal and hexadecimal. To convert to decimal, just add up the 1s using their values. The values that are turned on with the binary number of 10110111 are 128+32+16+4+2+1=183. To get the hexadecimal equivalent, you need to break the eight binary digits into nibbles (4 bits), 1011 and 0111. By adding up these values, you get 11 and 7. In hexadecimal, 11 is B, so the answer is 0xB7.

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