Chapter 7 (IP addressing)

Question 1

Broadcast Address

Answer 1

Address used by application and hosts to send information to all hosts on a network.

Question 2

IP address is how many bits?

Answer 2

32

Question 3

The bits in an IP address is divided in four sections call what?

Answer 3

An octet

Question 4

The IP addressing scheme is _______ as opposed to _________

Answer 4

1. structured/hierarchical

2. flat or non hierarchical

Question 5

Advantage and reason for hierarchical addressing scheme?

Answer 5

1. it can handle a lot of addresses.

2. good for routing.

Question 6

IP addressing is structured with what components?

Answer 6

network and host or network, subnet and host.

Question 7

“Network address”

Answer 7

aka: network number. Uniquely identifies each network.

Question 8

Function of the host address?

Answer 8

Uniquely identifies each machine on a network.

Question 9

Two components of a IP address?

Answer 9

1. Network

2. Host

Question 10

In class A, B and C how many bits are used for the network address and how many for host?

Answer 10

A = 8 bit for network 24 bits for hosts
B = 16 bits for network, 16 for hosts
C = 24 bits for network and 8 for hosts.

Question 11

The first bit of a Class A network address must always be?

Answer 11

Off. 0.

Question 12

Actual usable class a network addresses?

Answer 12

126

Question 13

Network address of all 0s means?

Answer 13

this network or segment.

Question 14

Network address of all 1s means?

Answer 14

all networks

Question 15

Host address of all 0s?

Answer 15

Network address or any host on specified network

Question 16

Host address of all 1s? eg: 128.2.255.255

Answer 16

All hosts on a specified network 128.2

Question 17

Entire IP address set to 1 means? eg: 255.255.255.255

Answer 17

Broadcast to all hosts on the current network.

Question 18

Each class A address has how many bytes for the host address?

Answer 18

3

Question 19

Class B address of 172.16.30.56. Which part is host with part is network address?

Answer 19

172. 16 is the host

30. 56 is the network address

Question 20

In a Class B network, the RFC states what about the first and second bit?

Answer 20

1st must always be on.

2nd must always be off.

Question 21

In a Class C address, the first 3 bit positions are always what?

Answer 21

110

Question 22

Class B network range?

Answer 22

128-191

Question 23

Class C network range?

Answer 23

192-223

Question 24

What class is network address 224?

Answer 24

D

Question 25

What class is network address 255?

Answer 25

E

Question 26

Reserved Private IP addresses for Class A

Answer 26

10.0.0.0-10.255.255.255

Question 27

Reserved Private IP addresses for Class B

Answer 27

172.16.0.0-172.31.255.255

Question 28

Reserved Private IP addresses for Class C

Answer 28

192.168.0.0-192.168.255.255

Question 29

Are private IP addresses routable through the Internet?

Answer 29

no

Question 30

What is NAT

Answer 30

process where a network device, usually a firewall, assigns a public address to a computer (or group of computers) inside a private network. The main use of NAT is to limit the number of public IP addresses an organization or company must use

Question 31

Default IP address range for APIPA

Answer 31

169.254.0.1-169.254.255.254

Question 32

Characteristics of Layer 2 broadcast?

Answer 32

Only go out on a LAN. Not past the LAN boundary...the router.

Question 33

Rule of Thumb when setting up a corp network, regardless of how small, what class network should you use?

Answer 33

Class A. Gives you the most flexibility and growth options. (p.197)

Question 34

CIDR

Answer 34

Classless Internet Domain Routing. | a method for allocating IP addresses and routing Internet Protocol packets.

Question 35

Layer 2 broadcast AKA

Answer 35

Hardware broadcast

Question 36

Char of Layer 3 broadcast

Answer 36

Broadcast is meant to reach all hosts on a broadcast domain. (Have all their bits on.)

Question 37

Good example of a Layer 3 broadcast?

Answer 37

An ARP request. "If you are the owner of IP address xxx.xxx.xxx.xxx please forward your MAC addy to me"

Question 38

Char of a Unicast.

Answer 38

communication where a piece of information is sent from one point to another point. In this case there is just one sender, and one receiver.

Question 39

Char of a Multicast address

Answer 39

the delivery of a message or information to a group of destination computers simultaneously in a single transmission from the source