First Term, Academic Year 2020/2021
M 418 - Computer Networks
Sheet 1
Helwan University
Faculty of since
Math. Department
St. Name:
Serial ID:
Major:
First: Choose the correct answer (1 mark)
1.
A basic computer network can be described as:
A. a minimum of five computers linked together.
B. computer and cables that link the network together.
C. two or more computers that are linked together.
D. the use of satellites linking computers together.
2.
LAN stands for:
A. local area nodes.
B. logical arrangement of networks.
C. local area network.
D. linked-area network.
3.
The primary difference between a LAN and a WAN is:
A. the number of software programs available.
B. distance.
C. the variety of hardware devices.
D. the number of hardware devices.
4.
Each individual computer and component attached to a network is a:
A. node.
B. connection point.
C. switch.
D. hub.
5.
MAN stands for:
A. metropolitan area network.
B. marked area network.
C. metropolitan arranged network.
D. manufactured arrangement of networks.
6.
The common pathways on a WAN are known as:
A. nodes.
B. hubs.
C. the backbone.
D. routers.
7.
Crossing from one LAN to another LAN or a WAN is done over:
A. bridges and gateways.
B. routers.
C. backbones.
D. MANs.
8.
The hardware device or software program that sends messages between networks is known as a:
A. bridge.
B. router.
C. backbone.
D. gateway.
9.
A port is a:
A. socket that enables information to move through a system.
B. hardware device that allows connection to the Internet.
C. peripheral device attached to a computer.
D. space located in the front of a computer to install additional drives.
10.
What type of cable uses light waves to carry information at high speed?
A. Cable modems
B. fiber-optic cables
C. Wireless cables
D. Phone lines
11.
The rules for exchanging data between a terminal and one or more computers is known as a(n):
A. protocol.
B. algorithm.
C. procedure.
D. set of laws.
12.
What is a LAN that has one or more dedicated computers and all others act as recipients?
A. Peer-to-peer model
B. P-to-p model
C. Ring network
D. Client/server model
Second: Fill in the Blank (2 mark)
1.
A(n) WAN is a network of networked computers that are physically located far apart from one another.
2.
A(n) Node is a computer or peripheral device attached to a network.
3.
A(n) Wireless network connects computers through radio transmitters connected to the network port.
4.
A(n) GPS includes 24 satellites that circle the Earth.
5.
Bps stands for Bits Per Second.
6.
When using multimedia or downloading huge files from the Internet, the bigger the Bandwidth, the
better.
7.
Fiber Optics cables are faster than DSL or cable modems.
8.
Many laptops and handheld computer have infrared ports that can send and receive digital information
short distances. Line-of-sight is a limitation.
9.
To communicate with each other, two machines must follow the same Protocol which are the rules for
the exchange of data.
10.
Client software sends requests from the user to the server.
Third: Answer the following (2 mark)
1. Define line configuration and give its types.
Line configuration refers to the way two or more communication devices attached to a link.
There are two Possible Configuration: a) P2P (Peer to Peer)
b) Multipoint
2. Mention the different physical media.
Two main categories:
– Guided → wires, cables
– Unguided → wireless transmission, e.g. radio, microwave, infrared, sound, sonar.
3. Define topology and mention the types of topologies.
Logical layout of Wire and Equipment.
Types are: a. Mesh
b. Star
c. Bus
d. Ring
e. Hybrid
4. What is meant by bridge?
A Network device that connects Two or More LANs (local area networks) together Network is
segmented by MAC address.
5. What is the difference between switch and bridge?
Switch transfer to Selected and Bridge transfer to All.
6. What is packet?
Packets is pieces of data transmitted over a network.
7. What is circuit switching and packet switching?
Packet-switched networks move data in separate, small blocks - packets - based on the destination
address in each packet.
Circuit-switched networks require dedicated point-to-point connections during calls.
8. Define Gateway.
Network Hardware that Connects two dissimilar networks.
9. What are the three criteria necessary for an effective and efficient network?
Performance, reliability, and security.
10. What is LAN?
A local area network is collection of devices connected in one Physical location.
11. What is bridge?
A Network device that connects Two or More LANs (local area networks) together, Network is
segmented by MAC address.
12. What is a repeater?
A Network Device that receive a signal and retransmitted it.
13. Define router
A Network Device Connects two or more LANs together that forwards data packets between
computer networks and perform the traffic directing functions on the Internet, Network is segmented
by IP address.
14. What is a switch?
A network hardware device (multiport network bridge) that connects network by using packet
switching to receive and forward data at the data link layer of the OSI model Network is segmented
by MAC address.
15. What are the functions of bridge?
Connect two or more LAN together.
16. What is routing?
is the process of selecting a path for traffic in a network or between or across multiple networks.