Q1: With the help of neat sequence diagrams, explain–
(i) Stop and wait protocol
(ii) Go – back – N ARQ sliding window protocol.
Q2: When a network performs poorly, its users often complain to the administrators running it and demanding improvements. To improve the performance, the operators must first determine exactly what is going on? To find out what is really happening, the operators must make some measurements. What are these measurements?
Q3: Explain the various classifications of Computer Networks based on size, topology etc. Compare and contrast the advantages and disadvantages in each classification.
Q4: What is Routing, Explain Shortest Path Routing algorithm with example?
Q5: What is the difference between asynchronous and synchronous transmission?
Q6: Explain ISO – OSI, seven layer network architecture giving the functions of each layer.
Q7a: Explain Ethernet MAC sub layer protocol with frame formats and also analyze its performance.
Q7b: Given an IP address 192.168.0.5
i) What is the binary equivalent of second octet?
ii) What is the class of this address?
iii) What is the network address of the given IP address?
Case Study
Congestion control refers to the techniques and mechanism that can either prevent congestion, before it happens, or remove congestion, after it has happened. In general, we can divide congestion control mechanism into two broad categories: Open loop congestion control (Prevention) and Closed-loop Congestion Control (Removal).
Q1: In how many way congestion control techniques can be applied? Explain.
Q2: In the given TCP network, R1 and R2 are two routers and network 1 and network 2 are the part of this TCP network. The input data rate of router R1 is 7 mb/s and output data rate of same router is 6.53 mb/s. Will there be congestion? If yes then how you will control the congestion in this TCP network?
Assignment – C
Q1: A modem that doesn’t need to be connected to a telephone line is the ________ modem
a. external
b. internal
c. wireless
d. fax
Q2: A modem that is contained within the system unit is called a(n) ________ modem
a. external
b. internal
c. wireless
d. fax
Q3: A credit card-sized expansion board that is inserted into portable computers that connects the modem to the telephone wall jack is the ________.
a. Internal modem
b. External modem
c. PC Card modem
d. Wireless modem
Q4: Computers, in contrast, send and receive ________ signals
a. analog
b. digital
c. modulated
d. demodulated
Q5: The telephone is an example of a(n) ________ signal.
a. analog
b. digital
c. modulated
d. demodulated
Q6: Layer one of the OSI model is–
a. Physical layer
b. Link layer
c. Transport layer
d. Network layer
Q7: In which topology, if a computer’s network cable is broken, whole network goes down.
a. Bus
b. Star
c. Tree
d. Mesh
Q8: For large networks, which topology is used?
a. Bus
b. Star
c. Ring
d. Mesh
Q9: In OSI network architecture, the dialogue control and token management are responsibilities of-
a. Session layer
b. Network layer
c. Transport layer
d. Data link layer
Q10: What is max data capacity for optical fiber cable?
a. 10 mbps
b. 100 mbps
c. 1000 mbps
d. 10000 mbps
Q11: If a computer on the network shares resources for others to use, it is called–
a. Server
b. Client
c. Mainframe
d. None of above
Q12: Which of the following is used for modulation and demodulation?
a. Modem
b. Protocol
c. Gateway
d. Multiplexer
Q13: ISO OSI model is used in–
a. Stand alone PC
b. Network environment
c. Sub network access
d. None of above
Q14: Network cable lies on layer–
a. Application
b. Network
c. Physical
d. Data link
Q15: In OSI network architecture, the routing is performed by–
a. Network layer
b. Data link layer
c. Transport layer
d. Session layer
Q16: Which connector is used in STP?
a. BNC
b. RJ-11
c. RJ-45
d. RJ-69
Q17: What is the max data capacity of STP?
a. 10 mbps
b. 100 mbps
c. 1000 mbps
d. 10000 mbps
Q18: What is the max cable length of STP?
a. 100 ft
b. 200 ft
c. 100 m
d. 200 m
Q19: Which buffer holds the data before it is sent to the printer through print server?
a. Queue
b. Spool
c. Node
d. None of above
Q20: Which server allows LAN users to share computer programs and data?
a. Communication server
b. Print server
c. File server
d. Mail Server
Q21: What is the central device in star topology?
a. STP server
b. Hub/switch
c. PDC
d. Router
Q22: The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as–
a. Modulation
b. Demodulation
c. Synchronizing
d. Digitising
Q23: A standalone program that has been modified to work on a LAN by including concurrency controls such as file and record locking is an example of–
a. LAN intrinsic software
b. LAN aware software
c. Groupware
d. LAN ignorant software
Q24: In which portion of LAN management software restricts access, records user activities and audit data etc?
a. Configuration management
b. Security management
c. Performance management
d. Switch Management
Q25: ISDN is an example of which network?
a. Circuit switched
b. Packet switched
c. Both of above
d. None of above
Q26: Which of the following architecture uses CSMA/CD access method?
a. ARC net
b. Ethernet
c. Both of above
d. None of above
Q27: X.25 is an example of which network?
a. Circuit switched
b. Packet switched
c. Both of above
d. None of above
Q28: Which layer decides which physical pathway the data should take?
a. Application
b. Network
c. Physical
d. Data
Q29: Which of the following performs modulation and demodulation?
a. Fibre optics
b. Satellite
c. Coaxial cable
d. Modem
Q30: One of the most dramatic changes in connectivity and communications in the past five years has been ________.
a. mobile or wireless telephones
b. public and private discussion
c. satellite uplinks
d. running programs on remote computers
Q31: How many OSI layers are covered in the X.25 standard?
a. Two
b. Three
c. seven
d. six
Q32: Communication circuits that transmit data in both directions but not at the same time are operating in
a. A simplex mode
b. A half duplex mode
c. A full duplex mode
d. An asynchronous mode
Q33: The interactive transmission of data within a time sharing system may be best suited to–
a. Simplex lines
b. Half-duplex lines
c. Full duplex lines
d. Biflex-lines
Q34: Which of the following is not a transmission medium?
a. Telephone lines
b. Coaxial cables
c. Modem
d. Microwave systems
Q35: Which of the following is required to communicate between two computers?
a. Communications software
b. Protocol
c. Communication hardware
d. All of above including access to transmission medium
Q36: A band is always equivalent to
a. A Byte
b. A Bit
c. 100 bits
d. None of the Above
Q37: Connectivity is a concept related to ________.
a. transmitting information, either by computer or by phone
b. the interconnections within a computer
c. using computer networks to link people and resources
d. being in an active session with your computer
Q38: Electronic systems that transmit data over communications lines from one location to another are called ________.
a. transmission systems
b. communications systems
c. microcomputer systems
d. LAN transmission systems
Q39: What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
a. 4
b. 2
c. 6
d. 3
Q40: Which of the following signal is not standard RS-232-C signal?
a. VDR
b. RTS
c. CTS
d. DSR
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