CN

ip addresses:
http://www.sebastienadam.be/connaissances/exercices/adressage_ip_v4.php
http://devinfos.blogspot.in/search/label/R%C3%A9seau

 Cut into 16 subnets 150.27.0.0 the network mask 255.255.0.0 Indicate for each subnet address list due to a machine as well as the broadcast address.
solution:  http://fr.wikibooks.org/wiki/R%C3%A9seaux_TCP/IP/Adressage_IP_v4#EXERCICE_4

 Redécoupez 8 subnets third subnet used among these 16. How many machines can hold up each of these subnets?

• If the administrator gives twice the same IP address to two different machines on the network, what's happening?

a) Both machines work very well. 

b) The first machine to get the network IP address works but not the second. 

c) No machine works. d) The flow is divided between the two machines.

•  A class B network is divided into several sub-networks and a final mask 255.255.252.0 worth is obtained. In how many subnets the originating network has he been cut?

a) 32
b) 64
c) 128
d) 256

ANSWER b) 
The net-id consists of 22 bits. In a Class B network, the net-id consists of 16 bits. The network has been divided into 2 ^ 6 = 64

• A network as 255.255.255.224 mask. How many machines can there be on such a network?

a) 254
b) 128
c) 224
d) 30

ANSWER d)
The net-id departure has 8 +8 +8 +3 = 27 bits to 1. The host-id therefore comprises 5 bits. It can be 2 ^ 5-2 = 30 machines on the network (32 minus the broadcast address and network).

• On a TCP / IP network which sets the IP address of a machine?

a) The manufacturer of the Ethernet card. 
b) it is fixed randomly at boot time. 
c) The network administrator. 
d) The Head of Department.

• A machine as IP address 150.56.188.80 is located in a network in which the mask is 255.255.240.0. What is the network address?

a) 150.56.0.0 
b) 150.56.128.0 
c) 150.56.176.0 
d) 150.56.192.0

ANSWER c) 
188 is written in base 2: 10111100. Net-id is 20 bits. The network address is obtained by putting all the bits of the host-id to 0. We thus obtain (1011 0000) .0 = 150.56. 150.56.176.0

• On cutting a network whose mask is 255.255.224.0 into 16 subnets. What is the new mask?

a) 255.255.254.0
b) 255.255.255.0
c) 255.255.252.0
d) 255.255.248.0

ANSWER a) 
The former net-id is 19 bits. By cutting at 16, 4 bits are added to the net-id, or 23 bits. The new mask is 255.255. (1111 1110) .0 is 255.255.254.0

• .Where the IP protocol is used over the Ethernet protocol, IP address, she has the same value as the net ether address?

a) True
b) False
c) it depends ANSWER b) 

This is ridiculous because the Ethernet address is 48 bits and is determined by the manufacturer of the card while the IP address is 32 bits and is determined by the network administrator.

• The IP protocol used to interconnect a Class A network with a Class C network

a) True
b) False

ANSWER a) allows IP to interconnect networks vary in size.

source:http://fr.wikibooks.org/wiki/R%C3%A9seaux_TCP/IP/Adressage_IP_v4