Printed Pages : 3

ECS601

(Following Paper ID and Roil No. to be fi[ed in your Answer Book]

B.Tech.

(SEMESTER-Vr) THEORY EXAMTNATION, 2013-13

COMPUTERNETWORK Time:3 Hours I

{ Total Marks : l0A SECTION _ A

Attempt all parts.

1.

(a)

which of the communication modes support two-way haffic but in only

direction

(b) (c) (d) (e) (0 (g)

l0 x2=20 one

?

Explain the differences between 10 BaseT and 10 Base2 cabling. Why and how is bit stuffing used in framing ? In what situations contention based MAC protocols are suitable

what

are the goals needed

in achieving a good routing algorithm

What is a broadcast Ip address What is piggy backing

? ?

?

?

(h)Brieflydescribeanytwosessionrelatedservices.

(i) (,)

List.some of the major security problems that exist on the Internet. What are the email gateways ? ,

SECTION * B

2.

Attempt any three parts.

(a)

what

are the salient features

10x3:30 of ISDN

ISDN.

(b)

functidns of different layers in

Explain performance issues for the following data link control protocols (i) Go-back-n

(ii) 2474

? Discuss the

:

Sliding-window

Illlllllillllllllllililil

r

P.T.O.

(c)

IPv4' What is the Explain briefly, the new features in IPv6 as compared to handles multiple purpose of multiple headers ? Explain briefly, how IPv6 headers.

(d)Whatispublickeycryptography?Listitsadvantagesarrddisadvantages.Explain how RSA works.

(e)

in brief SMTP emphasizing Explain how does e-mail reach to destination. Explain Agent (MTA)' the role and function of User Agent (UA) and Maitr Transfer

SECTION _ C Attempt all

3.

AtternPt anY two Parts.

(a)

that distinguish Explain Guided transmission media. Mention the characteristics optical f?om twisted pair or coaxial cabie'

(b)

by Service what are the key benefits of layered network ? what do you mean Access Point

(c) 4.

10 x 5 = 50

Parts.

?

distortion' Explain degradation of signal quality due to attenuation and delay

Attempt anY two Parts.

(a)

channel with consider the use of 10 K-bit size frames on a 10. Mbps satellite ARQ technique 770 rns delay. what is the link utilization for stop-and-wait

assumingP:10-3? (b)

"'

happens at Prove,that for a slotted ALOHA system, the maximum throughput

G:lwhereGisthenumberofattemptsperpackettime.

(c)

How is line coding implemented in

FDDL ,

5.

Attempt anY two

(a) (b)

Parts.

,;

How is subnet mask useful in IP addressing

?

Explain with an example'

method for What are the reasons for congestion in a network ? Describe any one congestion control.

(c)

vector routing Discuss the problem of count to infinity associated with distance technique.

2474

?'

[1

I

6.

Attempt any two

paxts.

r'l

(a)

Explain how

O)

How does the transport layer ensure that the coniplete message arrives at the

a

session layer establishes, mairitains and synchronizes the interaction between two communicating hosts. destination and in the proper order ?

(c)

7.

What is TCP ? Connection termination in TCP is symmetric, whereas connection establishment is not. Why ?

Attempt any two parts.

(a) (b) (c)

.

What is multipurpose lnternet Mail Extension (MME) and for what it is used ? Differentiate between SMTP and HTTp.

How does FTP work

?

Differentiate between passive and active FTp.

I I

3,

2474

3 6L.

.h*.i-}}€

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