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2007 Gautam Buddh Technical University (Formerly UPTU) B.Tech Electronics and Communications Engineering eighth sem data communication networks(uptu) Question paper

Course: B.Tech Electronics and Communications Engineering   University/board: Gautam Buddh Technical University (Formerly UPTU)

Eighth Semester Examination,2007-2008
Data Communication Networks(TEC-802)

Note:Attempt ALL questions.All questions carry equal marks.

Q.1.Attempt any four parts of the following:

(a)Discuss the major design issues for the layered architecture of data communication.How two layers exchange information?

(b)How service primitives are classified?Give the service primitives for a connection-oriented service and show relationship pf service to protocols.

(c)Compare the similarities and differences between the OSI and TCP reference models and comment on their usefulness.

(d)Give the mechanical,electrical and functional specifications of RS-232C interface.

(e)Draw a fibre optic ring with active repeaters and give details of the interface.Also compare optical fibre cable versus coaxial cable.

(f)Show the various interchange circuits associated with X21 and outline their function.Describe the operation of X21 interface protocol with time sequence diagrams.

Q.2.Attempt any four parts of the following:

(a)What is flow control?Explain the stop and wait flow control and show that the link utilization efficiency is given by 1/[1+2(t prop/t frame)]

(b)Give the frame structure for HDLC.Explain the control field of HDLC prtocol.Why this protocol is sometimes called super set of all link level protocols?

(c)Explain the meaning of following terms relating to data link protocols:

(1)Character oriented
(2)Bit oriented
(3)Framing and data transparency
(4)Poll select
(5)Primary and Secondary

(d)Differentiate between pure and slotted ALOHA.Show frame transmission and vulnerable time for slotted ALOHA and prove that the maximum utilization of slotted ALOHA occurs at G=1 with value 36.8%

(e)Compare the IEEE 802 protocol layers with OSI reference model.How the IEEE 802.3 standard differs from Ethernet?Draw the format of IEEE 802.3 CSMA/CD frame and give its address fields.

(f)Explain the operation of token ring network and give IEEE 802.5 frame format.How priority mechanism is included in IEEE 802.5 standards?Make comparison of IEEE 802.3,802.4 and 802.5 standards.

Q.3..Attempt any two parts of the following:

(a)What are the basic features of a routing algorithm?Give the Bellman-Ford routing algorithm and illustrate by an example.What is count to infinity problem?How the split horizon algorithm overcomes this problem?When does this approach fail?

(b)What is difference between open loop and closed loop congestion contol?How traffic policing differs from traffic shaping?Draw and explain the flow chart of the leaky bucket algorithm used for policing the traffic.How the leaky bucket is used as traffic shaper?

(c)(1)Produce a sketch of an internet to illustrate the role of a subnet router,interior gateway and exterior gateway.
(2)In relation to internet produced for part (1),identify the scope of the Address Resolution Protocol(ARP),Interior Gateway Protocol(IGP) and Exterior Gateway Protocol(EGP).
(3)List the message types associated with Internet Control Message Protocol(ICMP).

Q.4.Attempt any two parts of the following:

(a)Show the fields that make up the header of a TCP segment and explain the function of each.Why and how TCP pseudoheader is used?In addition to having acknowledgement field in the TCP header,ACK bit is also provided.What would happen if the ACK bit were not provided?

(b)Is a deadlock possible using only two-way handshake rather than a three way handshake to setup connections?Give an example or prove otherwise.Explain the connection establishment and connection termination using three way handshaking.How half open connections are killed off?

(c)What are the basic functions of ATM Adaptation Layer(AAL)?Show that AAL sublayers and their purpos.What are the drawbacks of AAL3/4?How AAL5 overcomes them?Explain the operation of AAL5 clearly showing the Convergence and SAR sublayer and the CPCS-PDU.

Q.5.Attempt any four parts of the following:

(a)Under what situations mapping of physical address to logical address is needed?Name the various protocols for this purpose and show how DHCP(Dynamic Host Configuration Protocol)can provide static and dynamic address allocation that can be manual or automatic.

(b)What are the functions to be performed by a network management system?Show the components of the SNMP manangement model and discuss the object groups of the Management Information Base version MIB2.

(c)what is the need of Trivila File Transfer Protocol(TFTP)?Give the different types of TFTP messages alongwith their formats.
In TFTP,indicate the next message sent by the client/server when
(1)The Read Request from the client is lost in transit.
(2)Data message containing less than 512 octets from the client is lost in transit and the server times out.
(3)The acknowledgement from the server is lost and client timesout.

(d)What were the deficiencies of IPv4?Give advantages of IPv4 over IPv6.Make comparison between IPv4 and IPv6 packet headers and show how an IPv4 packet header can be converted to IPv6 packet header

(e)Why do we need a DNS system when we can directly use an IP address?What is DNS server?Explain generic domains,country domains and inverse domains in internet and give structure of the DNS messages.

(f)What is World Wide Web(WWW)?List major components that constitute the Web.How is HTTP related to WWW?Discuss salient features of HTTP and show similarities between HTTP,FTP and SMTP.

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