Answer the following questions: i. If we canextend the LAN then why we need aWAN

Question

Answer the following questions:

i.         If we canextend the LAN then why we need aWAN?                              [3]

ii.       How can a bridge knowwhether to forwardframes?                                  [2]

iii.      Can the length of an Ethernetbe increased to many segments of 500 meter each merely by adding arepeater to connect each additional segment?   [2]

iv.     How can a computer attach to anetwork that sends and receives bits faster than thecomputer’s CPU can handle them?                                            [3]

Explanation / Answer

ii. the bridge has a forwarding table. iii. Ethernet can be extended by adding repeaters, howeverthere is a maximum of 4 repeaters that can be added. After this,ethernet becomes too long and too inefficent because the vulnerabletime during which collisions can occur increasessignificantly. iv. While it is possible to connect to such a network, it isusually a bad idea because either you would lose the benefit ofhaving a fast network with a slow computer or when the bits orrecieved at the computer, they would simply be dropped which isalso inefficient. Thus, its usually a bad idea.

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