CS2060-high speed networks 2marks with answers for unit -1& part B questions(V+ edition).pdf

CS2060-HIGH SPEED NETWORKS

Question bank

1. Differentiate Frame relay and X.25 packet-switching service

-> Call control signaling is carried on a separate logical connection from

user data. Thus, intermediate nodes need not maintain state tables or process

messages relating to call control on an individual per-connection basis

-> Multiplexing and switching of logical connections takes place at layer2

instead of layer3, eliminating one entire layer of processing

->There is no hop-by-hop flow control and error control. End-to-end flow

control and error control are the responsibility of a higher layer, if they are

employed at all

2. What is jitter

The packets between a given source and destination may vary in length, may

take different routes, may be subject to varying delays in the switches they

encounter, the overall packet delay can vary substantially. This phenomenon,

called JITTER may not be desirable for some application; for example in real-

time applications including telephone voice and real-time video

3. List out some of the control functions of LAPF core

Frame delimiting, alignment and transparency

Frame multiplexing/demultiplexing using the address field

Detection of transmission errors

Congestion control functions

4. What is called a cell in ATM

In ATM, the information flow on each logical connection is organized into

fixed size packets called cells

5. What are the planes in protocol reference model

User plane

Control plane

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Unit -1Part-A

Management plane

6. What are the advantages of virtual paths

Simplified network architecture

Increased network performance and reliability

Reduced processing and short connection setup time

Enhanced network services

7. What is VPI

The Virtual path identifier constitutes a routing field for the network. It is 8

bits at the user-network interface and 12 bits at the network-network interface.

The latter allows support for an expanded number of VPCs internal to the

network, to include those supporting subscribers and those required for

network management

8. What is CLP

The cell loss priority bit is used to provide guidance to the network in the

event of congestion. A value of 0 indicates a cell of relatively higher priority,

which should not be discarded unless no other alternative is available. A

value of 1 indicates that this cell is subject to discard within the network

9. What are the services of ATM

The ATM services are:

Real time services:

Constant Bit Rate (CBR)

Real Time Variable Bit Rate (rt-VBR)

Non Real time services:

Non Real Time Variable Bit Rate (nrt-VBR)

Available Bit Rate (ABR)

Unspecified Bit Rate (UBR)

Guaranteed Frame Rate (GFR)

10. What is Frame Relay network

A form of packet switching based on the variable length link layer frames.

There is no network layer. Many of the basic functions have been streamlined

and eliminated to provide great throughput



11. What are the message types needed for Frame relay call control

SETUP

CONNECT

RELEASE

RELEASE COMPLETE

12. What are the AAL services

Handling of transmission errors

Segmentation and reassembly, to enable larger blocks of data to be carried in

the information field of ATM cells

Handling of lost and misinserted cell conditions

Flow control and timing control

13. What are the applications of AAL

Circuit emulation

VBR voice and video

General data services

IP over ATM

Multiprotocol encapsulation over ATM

LAN emulation

14. What is SNP

The sequence Number Protection field is an error code for detection and

possibly correction on the sequence number field. It consists of a 3 bit cyclic

redundancy check, calculated over the 4 bit SN field, and a parity bit. The

parity bit is set so that the parity of the 8 bit SAR header is even

15. Differentiate bridge and layer2 switch

Bridge Layer2Switch

Frame handling alone in software Frame handling in hardware

Analyze & forward one frame at Multiple data paths & can handle

at a time multiple frames at a time

Store and forward Can do cut through

16. What are the benefits of 10 Gbps Ethernet over ATM

->No expensive, bandwidth consuming conversion between Ethernet packets

and ATM cells



->Network is Ethernet end to end

->IP plus Ethernet offers QoS and traffic policing capabilities approach that of

ATM

->Wide variety of standard optical interfaces for 10Gbps ethernet

17. What is the purpose of Fiber channel

Fiber channel is designed to combine the best features of both technologies

the simplicity and speed of channel communication with the flexibility and

interconnectivity that characterize protocol based network communication

18. List some of the requirements of Wireless LAN

Throughput

Number of nodes

Connection to backbone LAN

Service area

Handoff/roaming

Dynamic configuration

19. What are the IEEE 802.11 services

Association

Reassociation

Disassociation

Authentication

Privacy

20. What are the physical medias defined in 802.11

->Direct sequence spread spectrum operating in the 2.4 GHz ISM band, at

data rates of 1 Mbps and 2 Mbps

-> Frequency hopping spread spectrum (FHSS) operating in the 2.4GHz ISM

band at data rates of 1Mbps and 2Mbps

-> Infrared at 1 Mbps and 2 Mbps operating at a wavelength between 850 and

950nm



Part-B

1. Explain in detail about Frame relay architecture and Frame Call Control?

2. Explain in detail about the ATM architecture?

3. What is a ATM cell? Explain about the ATM cell format?

4. Write in detail about Generic Flow control?

5. What are the ATM service categories? Explain?

6. Explain about the different AAL protocols?

7. Explain in detail about the Fiber channel?

8. What are the various IEEE 802.11 requirements?

9. Explain in detail about IEEE 802.11 architecture and services?

10. Explain about the IEEE 802.11 protocol architecture?



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CS2060-high speed networks 2marks with answers for unit -1& part B questions(V+ edition).pdf