The physical layer service is a non-confirmed service. Assume that some bits of data are lost during transmission over physical media, which layer will detect the loss and take some remedial measures. Explain any one method clearly depicting how this operation is performed.

2723

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What are the advantages of cell switching that is used in ATM?

2492

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Outline and discuss the main fields in Ethernet IEEE 802.3 frame. What are the main objectives of preamble ?

1924

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What is the average number of transmission required to send a frame of length 1600 bytes correctly, if the bit error rate is 1 x 10-6.

1596

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Explain what is meant by the term ‘integrated service digital network’. Give three reasons a company might choose an ISDN link in preference to a leased line.

1623

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Subnet the class C network address 198.67.25.0 into eight subnets. Why are the ‘all ones’ and ‘all zeroes’ subnets not used ?

1883

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What do you understand by the term ‘structured cabling’. State the main rules that should be used when installing a cable. 31. Show that maximum cabling area for LAN for horizontal cabling runs is approximately 200m.

1642

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What are the various classes of IP addressing? Calculate the maximum number of class A, B and C network Ids.

1763

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Why is a data link layer switch preferred over a hub ?

2092

---

Which device is needed to connect two LANs with different network Ids ?

1747

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When is a translating bridge used ?

1697

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Can a switch be used to connect two LANs with different network IDs ?

1642

---

Write two ways in which computer applications differ from network applications ?

1703

---

What is count to infinity problem ?

1730

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What was the reason for selecting a speed of 155.52 Mbps in the original ATM standard ?

1751

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