Lan Technology
Contents
Question-1 2
Question-2 3
Question-3 6
Question-4 7
Question-5 8
Question-6 9
Question-7 10
Question-8 11
Question-1
Discuss the two basic “media access control” methods for shared media used in the TCP/IP suite.
ANSWER:
In the Open Systems Interconnection (OSI) model of communication, the Media Access Control layer is one of two sub layers of the Data Link Control layer and is concerned with sharing the physical connection to the network among several computers. Each computer has its own unique MAC address. Ethernet is an example of a protocol that works at the Media Access Control layer level.
There are two basic media access control methods for shared media:
1. Controlled access method.
2. Contention based access method.
Controlled accessed method:
When using the controlled access method, network devices take turns, in sequence, to access the medium. This method is also known as scheduled access or deterministic. If a device does not need to access the medium, the opportunity to use the medium passes to the next device in line. When one device places a frame on the media, no other device can do so until the frame has arrived at the destination and has been processed by the destination.
Although controlled access is well-ordered and provides predictable throughput, deterministic methods can be inefficient because a device has to wait for its turn before it can use the medium.
Connection based access method:
Also referred to as non-deterministic, contention-based methods allow any device to try to access the medium whenever it has data to send. To prevent complete chaos on the media, these methods use a Carrier Sense Multiple Access (CSMA) process to first detect if the media is carrying a signal. If a carrier signal on the media from another node is detected, it means that another device is transmitting. When the device attempting to transmit sees that the media is busy, it will wait and try again after a short time period. If no carrier
Question-1 2
Question-2 3
Question-3 6
Question-4 7
Question-5 8
Question-6 9
Question-7 10
Question-8 11
Question-1
Discuss the two basic “media access control” methods for shared media used in the TCP/IP suite.
ANSWER:
In the Open Systems Interconnection (OSI) model of communication, the Media Access Control layer is one of two sub layers of the Data Link Control layer and is concerned with sharing the physical connection to the network among several computers. Each computer has its own unique MAC address. Ethernet is an example of a protocol that works at the Media Access Control layer level.
There are two basic media access control methods for shared media:
1. Controlled access method.
2. Contention based access method.
Controlled accessed method:
When using the controlled access method, network devices take turns, in sequence, to access the medium. This method is also known as scheduled access or deterministic. If a device does not need to access the medium, the opportunity to use the medium passes to the next device in line. When one device places a frame on the media, no other device can do so until the frame has arrived at the destination and has been processed by the destination.
Although controlled access is well-ordered and provides predictable throughput, deterministic methods can be inefficient because a device has to wait for its turn before it can use the medium.
Connection based access method:
Also referred to as non-deterministic, contention-based methods allow any device to try to access the medium whenever it has data to send. To prevent complete chaos on the media, these methods use a Carrier Sense Multiple Access (CSMA) process to first detect if the media is carrying a signal. If a carrier signal on the media from another node is detected, it means that another device is transmitting. When the device attempting to transmit sees that the media is busy, it will wait and try again after a short time period. If no carrier