Maram

Student Name : Maram Sulaiman alkahlan
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Id : 430002978 Section : I4
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Homework Chapter 1
Review Questions :
3- What Are Three Criteria Necessary For An Effective And Efficient Network? * Performance * Reliability * Security
4-what are the advantages of a multipoint connection over a point-to-point connection?
Point-to-point connection is limited to two devices, where else more than two devices share a single link in multipoint connection. Multipoint connection can be used for fail-over and reliability.
5 - what are the two type of line configuration?
There are two possible types of line configurations or connections. These connections are.
1. Point-to-point connection
2. Multipoint connection
6- categorize the four basic topologies in terms of line configuration ?
Point to point- mesh and star.
Multi point- bus and ring.
7- what is the difference between half-duplex and full-duplex transmission modes?
Full duplex allows transmitting and receiving at the same time. Half duplex allows transmitting and receiving, but not at the same time.
8- name the four basic network topologies and cite an advantage of each type? * Mesh Topology : Privacy or security . eliminating the traffic problems . A mesh is robust . Fault identification and fault isolation easy . * Star topology : Easy to install and reconfigure and less expensive . Robustness . identification and fault isolation . * Bus topology : Ease of insulation .

* Ring Topology : Easy to install and reconfigure . Fault isolation is simplified . Unidirectional traffic .

11- what is a internet ? what is the Internet ?
Internet : a collaboration of more than 100 of 1000 interconnected network.

Exercises :

16- assume six devices are arranged in a mesh topology. how many cables are needed ? how many ports are needed for each device ?
Devices- 6
W= n(n-1)/2 solution :
W= 6(6-1)/2
=6(5)/2
=3(5)
=15
15 cables
And you will need 5 ports on each of the devices.

18- You have two computers connected by an Ethernet hub at home. Is this a LAN, a MAN, or a WAN? Explain your reason .
These Small sizes networks are categorized to LAN. Ethernet is a LAN. All small sized office networks and in-house networks are LANs. MAN owned by single company, it's averagely large network.
21- Draw a hybrid topology with a star backbone and three ring networks ?

22- Draw a hybrid topology with a ring backbone and two bus networks ?

23- performance is inversely related to delay. when you use the internet which of the following app are more sensitive to delay ?
a. Sending an Email : E-mail is not an interactive application. Even if it is delivered immediately, it may stay in the mail-box of the receiver for a while. It is not sensitive to delay.
b. copying a file : We normally do not expect a file to be copied immediately. It is not very sensitive to delay.
c. surfing the Internet : Surfing the Internet is the an application very sensitive to delay. We except to get access to the site we are searching.

24- when a party makes a local telephone call to another party , is this point to point or multipoint ? Explain .
In this case, the communication is only between a caller and the called . A dedicated line is established between them. The connection is point-to-point.