Chapter 1
Answers
Q1-1.
Answer: a) Sender b) Receiver c) Transmission Medium d) Message e) Protocol.
Q1-2.
Answer: An effective and efficiency network depends on Performance, Reliability and Security.
Q1-3.
Answer: In point-to-point connection one link is shared between only two devices but in multipoint connection more than two devices can be connected to single link so it makes multipoint connection less expensive.
Q1-4.
Answer: Two types of line configuration are- a) point-to-point connection, b) Multipoint connection.
Q1-5.
Answer: There are four basic topologies possible:
a) Mesh topology: In mesh topology, every device has point-to-point link to every other device.
b) Star topology: In star topology, each device has a point-to-point…show more content… One long cable is used to link all the devices.
d) Ring topology: Ring topology is point-to-point connection with only the two devices on either side of it.
Q1-6.
Answer: In half duplex, each station can both transmit and receive data, but not at the same. But in full duplex both station can transmit and receive data at the same time.
Q1-7.
Answer: There are four basic topologies possible:
a) Mesh topology: The Mesh topology is robust. If one link is unusable, it does not harm other devices. It eliminates the traffic problem as every two devices shares at least one link There is also advantage of security and privacy.
b) Star topology Star topology is less expensive than mesh topology. It is robust. If one link fails, only that link will be affected.
c) Bus topology: Bus topology is easy to install as it uses less cabling than mesh or star topology.
d) Ring topology: A ring is relatively easy to install and easy to modify as each device is linked to its immediate neighbor. Only two connection needs to be changed to add or delete…show more content… Answer: The first principle says that each layer should be able to perform two opposite tasks to make bidirectional communication. For example, one layer should be able to perform encryption and decryption task. Encryption and decryption are two opposite task.
Q2-2.
Answer: a) Data Link Layer b) Physical Layer. Link-layer switch is involved in these layers of TCP/IP.
Q2-3.
Answer: We know that router is involved in one network layer, ‘n’ number of data link layer and physical layer where ‘n’ is number of links router is connected to. In the given question router is connected to three links therefore the router will be involved in three physical layers, three data link layers and one network layer.
Q2-4.
Answer: The identical object at the application layer in TCP/IP protocol suit are “messages”.
Q2-5.
Answer: Application layer: messages Network layer: datagrams Data link layer: frames
Q2-6.
Answer: All of the following data unit is encapsulated in a frame. A user datagram, datagram and a segment.
Q2-7.
Answer: message is decapsulated from a user datagram.
Q2-8.
Answer: A user datagram.
Q2-9.
Answer: a) Hypertext Transfer Protocol b) Simple Mail Transfer Protocol c) File Transfer
