Computer Networking PYQ Sheet - 01
- Frame Relay does not provide flow or error control, they must be provided by the.........
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(a) Lower Level Protocol
(b) highest level protocol
(c) Upper Level Protocol
(d) Lowest level protocol
Answer: c
- Open Shortest Path First (OSPF) is also called as........
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(a) Link state protocol
(b) Error-correction protocol
(c) Routing information protocol
(d) Border gateway protocol
Answer: a
- Application frameworks provide a means for creating........hosted application using iDE.
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(a) PaaS
(b) SaaS
(c) CaaS
(d) All of the above
Answer: b
- Which type of Ethernet framing is used for TCP/IP and DEC net?
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(a) Ethernet 802.3
(b) Ethernet 802.2
(c) Ethernet II
(d) Ethernet SNAP
Answer: c
- Which of the following is a transport layer protocol?
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(a) Stream control transmission protocol
(b) Internet control message protocol
(c) Neighbor discovery protocol
(d) Dynamic host configuration protocol
Answer: a
- User datagram protocol is called connectionless because..........
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(a) All UDP packets are treated independently by transport layer
(b) It sends data as a stream of related packets
(c) It is received in the same order as sent order
(d) It sends data very quickly
Answer: a
- The packet sent by node to the source to inform it of congestion is called.........
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(a) Explicit
(b) Discard
(c) Choke
(d) Backpressure
Answer: c
- Two broad categories of congestion control are
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(a) Open-loop and Closed-loop
(b) Open-control and Closed-control
(c) Active control and Passive control
(d) Active loop and Passive loop
Answer: a
- What protocol is NOT used in the operation of a VPN?
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(a) PPTP
(b) IPsec
(c) YMUM
(d) L2TP
Answer: c
- Communication offered by TCP is........
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(a) Full-duplex
(b) Half-duplex
(c) Semi-duplex
(d) Byte by byte
Answer: a
- TCP groups a number of bytes together into a packet called.......
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(a) Packet
(b) Buffer
(c) Segment
(d) Stack
Answer: c
- Which of the following statements is incorrect?
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(a) A Low-Earth-Orbit (LEO) is a circular orbit
(b) The period (time to evolve around the earth) of LEO satellites is about 90 minutes
(c) LEO satellites are more expensive to launch into orbit than geostationary satellites
(d) Satellites in low earth orbit change their position relative to the ground position quickly
Answer: c
- Which is an incorrect statement about FTP and TFTP?
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(a) FTP is a complete, session-oriented, general purpose file transfer protocol. TFTP is used as a bare-bones special purpose file transfer protocol.
(b) FTP can be used interactively. TFTP allows only unidirectional transfer of files.
(c) FTP depends on TCP, is connection oriented, and provides reliable control. TFTP depends on UDP, requires less overhead, and provides virtually no control.
(d) TFTP provides user authentication. FTP does not.
Answer: d
- While transmitting data, you receive any data from another station, there has been a message collision. All transmitting stations will need to try resending "later". These statements are related to:
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(a) CSMA/CD
(b) CSMA/CA
(c) Slotted ALOHA
(d) Pure ALOHA
Answer: d
- In computer networking, MAC address is:
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(a) Media Access Control address of 32 bits
(b)Medium Access Control address of 64 bits
(c) Media Access Control address of 48 bits
(d) Main Access Control address of 64 bits
Answer: c
- Number of possible network IDs in class-C address is:
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(a) 221
(b) 222
(c) 223
(d) 224
Answer: a
- Which of the following is a class-B IP address?
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(a) 127.255.255.255
(b) 10.0.255.255
(c) 191.255.255.255
(d) 192.0.0.0
Answer: c
- For connection establishment, TCP uses:
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(a) two way handshake
(b) three way handshake
(c) four way handshake
(d) five way handshake
Answer: b
- A multiple-access method in which, the available bandwidth of a link is shared in time, frequency, or through code, between different stations:
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(a) Random Access
(b) Limited Access
(c) Controlled Access
(d) Channelization
(e) Unrestricted
Answer: d
- For a given address 132.6.17.85, find the network address.
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(a) 255.255.0.0
(b) 132.6.0.1
(c) 132.6.0.0
(d) 192.168.0.1
Answer: c
- From earth, a satellite in a geostationary orbit appears motionless (in a fixed position in the sky) because:
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(a) the satellite revolves around the earth at the earth's own angular velocity.
(b) the satellite revolves around the earth at half of the earth's own angular velocity.
(c) the satellite revolves around the earth at quarter of the earth's own angular velocity.
(d) the satellite revolves around the earth at the double of the earth's own angular velocity.
Answer: a
- In CSMA/CD, the frame transmission time Tfr must be at least........times the maximum propagation time Tp.
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(a) 1
(b) 1.5
(c) 2
(d) None of the above
Answer: c
- In the communication of two processes, an endpoint for communication is called
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(a) Socket
(b) Pipe
(c) Port
(d) Remote procedure call
Answer: a
- Which protocol of the SSL/TLS protocol suite is used to exchange the information about cryptographic algorithms between client and server?
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(a) Handshake protocol
(b) change cipher-spec protocol
(c) Alert protocol
(d) Record protocol
Answer: a
- In the following pairs of OSI protocol layer/ sub layer and its functionality, the incorrect pair is
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(a) network layer and error correction
(b) data link layer and frame synchronization
(c) transport layer and end-to- end process communication
(d) physical layer and bit rate
Answer: a
- The transport layer protocols used for realtime multimedia, file transfer, DHCP and HTTP, respectively are
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(a) TCP, UDP, UDP and TCP
(b) UDP, TCP, TCP and UDP
(c) UDP, TCP, UDP and TCP
(d) TCP, UDP, TCP and UDP
Answer: c
- In the IPv4 addressing format, the number of hosts allowed in a particular subnet under class B addresses and 5-bit subnet is
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(a) 2048
(b) 4096
(c) 8192
(d) 1024
Answer: a
- An ACK number of 1000 in TCP always means that
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(a) 999 bytes have been successfully received
(b) 1000 bytes have been successfully received
(c) 1001 bytes have been successfully received
(d) None of the above
Answer: d
- How many bits internet address is assigned to each host on a TCP/IP internet which is used in all communication with the host?
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(a) 16 bits
(b) 32 bits
(c) 48 bits
(d) 64 bits
Answer: b
- What frequency range is used for microwave communications, satellite and radar?
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(a) Low frequency: 30 kHz to 300 kHz
(b) Medium frequency: 300 kHz to 3 MHz
(c) Super high frequency: 3000 MHz to 30000 MHz
(d) Extremely high frequency: 30000 kHz
Answer: d
- A T-switch is used to
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(a) Control how messages are passed between computers
(b) Echo every character that is received
(c) Transmit characters one at a time
(d) Rearrange the connections between computing equipments
Answer: d
- The DNS maps the IP address to
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(a) binary address as strings
(b) A n alphanumeric address
(c) A hierarchy of domain names
(d) A hexadecimal address
Answer: c
- An organization is granted the block 130.34.12.64/26. It needs to have 4 subnets. Which of the following is not an address of this organization?
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(a) 130.34.12.124
(b) 130.34.12.89
(c) 130.34.12.70
(d) 130.34.12.132
Answer: d
- Which of the following is not a valid multicast MAC address?
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(a) 01:00:5E:00:00:00
(b) 01:00:5E:00:00:FF
(c) 01:00:5E:00:FF:FF
(d) 01:00:5E:FF:FF:FF
Answer: d
- A mechanism or technology used in Ethernet by which two connected devices choose common transmission parameters such as speed, duplex mode and flow control is called
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(a) Autosense
(b) Synchronization
(c) Pinging
(d) Auto negotiation
Answer: d
- Suppose you are browsing the world wide web using a web browser and trying to access the web servers. What is the underlying protocol and port number that are being used?
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(a) UDP, 80
(b) TCP, 80
(c) TCP, 25
(d) UDP, 25
Answer: b
- A supernet has a first address of 205.16.32.0 and a supernet mask of 255.255.248.0. A router receives 4 packets with the following destination addresses.which packet belongs to this supernet?
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(a) 205.16.42.56
(b) 205.17.32.76
(c) 205.16.31.10
(d) 205.16.39.44
Answer: d
- An IP packet has arrived with the first 8 bits as 0100 0010. Which of the following is correct?
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(a) The number of hops this packet can travel is 2.
(b) The total number of bytes in header is 16 bytes
(c) The upper layer protocol is ICMP
(d) The receiver rejects the packet
Answer: d
- Consider a 50 kbps satellite channel with a 500 milliseconds round trip propagation delay. If the sender wants to transmit 1000 bit frames, how much time will it take for the receiver to receive the frame?
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(a) 250 milliseconds
(b) 20 milliseconds
(c) 520 milliseconds
(d) 270 milliseconds
Answer: d
- A IP packet has arrived in which the fragmentation offset value is 100,the value of HLEN is 5 and the value of total length field is 200. What is the number of the last byte?
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(a) 194
(b) 394
(c) 979
(d) 1179
Answer: c
- What is routing algorithm used by OSPF routing protocol?
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(a) Distance vector
(b) Flooding
(c) Path vector
(d) Link state
Answer: d
- The process of modifying IP address information in IP packet headers while in transit across a traffic routing device is called
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(a) Port address translation (PAT)
(b) Network address translation (NAT)
(c) Address mapping
(d) Port mapping
Answer: b
- The protocol data unit for the transport layer in the internet stack is
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(a) Segment
(b) Message
(c) Datagram
(d) Frame
Answer: a
- A packet filtering firewall can
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(a) Deny certain users from accessing a service
(b) Block worms and viruses from entering the network
(c) Disallow some files from being accessed through FTP
(d) Block some hosts from accessing the network
Answer: d
- Which algorithm is used to shape the bursty traffic into a fixed rate traffic by averaging the data rate?
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(a) Solid bucket algorithm
(b) Spanning tree algorithm
(c) Hocken helm algorithm
(d) Leaky bucket algorithm
Answer: d
- What is IP class and number of sub-networks if the subnet mask is 255.224.0.0?
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(a) Class A, 3
(b) Class A, 8
(c) Class B, 3
(d) Class B, 32
Answer: b
- IPv6 does not support which of the following addressing modes?
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(a) Unicast addressing
(b) Multicast addressing
(c) Broadcast addressing
(d) Anycast addressing
Answer: c
- Assume the following information:
Original timestamp value = 46
Receive timestamp value = 59
Transmit timestamp value = 60
Timestamp at arrival of packet=69
Which of the following statements is correct?
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(a) Receive clock should go back by 3 milliseconds
(b) Transmit and Receive clocks are synchronized
(c) Transmit clock should go back by 3 milliseconds
(d) Receive clock should go ahead by 1 milliseconds
Answer: a
- In CRC if the data unit is 100111001 and the divisor is 1011 then what is dividend at the receiver?
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(a) 100111001101
(b) 100111001011
(c) 100111001
(d) 100111001110
Answer: b
- How many characters per sec (7 bits + 1 parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 start and 1 stop bit)?
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(a) 300
(b) 240
(c) 250
(d) 275
Answer: a
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