answer those question in your own words. 1 describe the advantages and disadvant

Question

answer those question in your own words.

1 describe the advantages and disadvantages of a Mesh Topology versus Physical Ring topology (not a dual ring). Define a scenario where you are connecting about a dozen workstations and you would make the choice to set-up using a Mesh Topology. please expalin the answer

2 explain how Token Ring operates. Discuss the advantages and disadvantages of using Token Ring. Why do you think this technology is virtually obsolete?

3 discuss the two types of twisted-pair cable, unshielded and various methods of shielded. What is the impact of increasing the twists per foot or meter?

4 discuss the advantages and disadvantages of wired versus wireless networks.

Explanation / Answer

(1)

Mesh Topology:

Advantages:

Physical topology:

Disadvantages:

Physical topology:

Mesh topology:

Suppose we have a dozen devices on a network then mesh topology will be the one which is best for such scenario because it is robust.

(2)

Unlike Ethernet, Ring topology is used by Token Ring whereby the data which is send bythe sender will keep on rotating in the ring until it get's back where it started. Token passing protocol is used which means that a machine can only use the network whenever control is in token. Because of this system is assured that there are no collisions because now machine can use are network at any point of time. Token Ring networks are now very rare because the cost and flexibility of Ethernet  came to dominate the market.

Advantages:

This type of network topology is very organized. Each node gets to send the data when it receives an empty token. This helps to reduces chances of collision. Also in ring topology all the traffic flows in only one direction at very high speed.
Even when the load on the network increases, its performance is better than that of Bus topology.
There is no need for network server to control the connectivity between workstations. Additional components do not affect the performance of network. Each computer has equal access to resources.

Disadvantages:

Each packet of data must pass through all the computers between source and destination. This makes it slower than Star topology.

If one workstation or port goes down, the entire network gets affected.
Network is highly dependent on the wire which connects different components.
MAU’s and network cards are expensive as compared to Ethernet cards and hubs.

(3)

UTP Cable:

UTP cable is a medium that is composed of pairs of wires. UTP cable is used in a variety of networks. Each of the eight individual copper wires in UTP cable is covered by an insulating material. In addition, the wires in each pair are twisted around each other.

Shielded Twisted-Pair Cable:

Shielded twisted-pair (STP) cable combines the techniques of shielding, cancellation, and wire twisting. Each pair of wires is wrapped in a metallic foil. The four pairs of wires then are wrapped in an overall metallic braid or foil, usually 150-ohm cable. As specified for use in Ethernet network installations, STP reduces electrical noise both within the cable (pair-to-pair coupling, or crosstalk) and from outside the cable (EMI and RFI). STP usually is installed with STP data connector, which is created especially for the STP cable. However, STP cabling also can use the same RJ connectors that UTP uses.

(4)

Advantages:

Disadvantages:

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