subnetting

Question 1

IP address

Answer 1

A dotted decimal number that is
unique to the network.
192.168.1.150

Question 2

Subnet mask

Answer 2

A dotted decimal number that
identifies the host and network
portions of the IP address.
255.255.255.0

Question 3

Default gateway

Answer 3

The dotted decimal number that 
corresponds to the network 
device that connects the hosts on 
the current network to another 
network.
192.168.1.1

Question 4

Bit A bit is one binary digit, either a 1 or a 0.

Question 5

Byte A byte is 7 or 8 bits, depending on whether parity is used. For the rest of this chapter, always
assume a byte is 8 bits.

Question 6

Octet An octet, made up of 8 bits, is just an ordinary 8-bit binary number. In this chapter, the terms
byte and octet are completely interchangeable, and they are typically displayed in decimal up to 255.

Question 7

Octet An octet, made up of 8 bits, is just an ordinary 8-bit binary number. In this chapter, the terms
byte and octet are completely interchangeable, and they are typically displayed in decimal up to 255.

Question 8

Reserved as private IP addresses:

Answer 8

Class A: 10.0.0.0 to 10.255.255.255
Class B: 172.16.0.0 to 172.31.255.255
Class C: 192.168.0.0 to 192.168.255.255

Question 9

Subnet mask

Answer 9

Separates network and host (device) bits in an IPv4 address
A string of ones followed by some number of zeroes, always totaling exactly 32 bits, typed
into every TCP/IP host.

Question 10

255.0.0.0 (Class A)

Answer 10

1 to 127, with some being reserved

Question 11

255.255.0.0 (Class B)

Answer 11

128 to 191

Question 12

255.255.255.0 (Class C)

Answer 12

192 to 223

Question 13

Default Gateway

Answer 13

An IP address assigned to a router that forwards remote traffic from its local subnet to remote
networks.

Question 14

IPv6 Characteristics

Answer 14

An addressing scheme that uses a 128-bit binary address space
340 trillion, trillion, trillion addresses
You can omit any leading zeros from the address notation
You can compress a contiguous set of 0 blocks by using the double colon notation :: (can only
be used for 1 set per IPv6 address)

Question 15

Unicast

Answer 15

• Packet sent to a multicast 
address is delivered to all 
interfaces in the group.
• Targeted message goes only to 
members of the multicast group.
• Replaces IPv4 broadcast 
addressing.

Question 16

Anycast

Answer 16

• Data goes from a server to the 
nearest host in an anycast 
group.
• Host imitates another anycast 
and sends data to the next 
nearest host, until all hosts in 
the anycast group have the data.

Question 17

Address length

Answer 17

IPv4 addresses use 32 bits, whereas IPv6 addresses

use 128 bits.