WorksheetsComputer Networking
Total questions: 30
Worksheet time: 15mins
Which of the following is false with respect to UDP?
Connection-oriented
Unreliable
Transport layer protocol
Low overhead
What is the main advantage of UDP?
More overload
Reliable
Low overhead
Fast
The ______ field is used to detect errors over the entire user datagram.
udp header
checksum
source port
destination port
Size of TCP segment header ranges between ___________.
16 and 32 bytes
16 and 32 bits
20 and 60 bytes
20 and 60 bits
In Three-Way Handshaking process, the situation where both the TCP’s issue an active open is ___________.
Mutual open
Mutual Close
Simultaneous open
Simultaneous close
What allows TCP to detect lost segments and in turn recover from that loss?
Sequence number
Acknowledgment number
Checksum
Both Sequence & Acknowledgment number
To use the services of UDP, we need ……… socket addresses.
four
two
three
four
UDP packets have a fixed-size header of ………. bytes.
16
8
32
64
Header size of the ICMP message is _________.
8-bytes
8-bits
16-bytes
16-bits
During error reporting, ICMP always reports error messages to ________.
Destination
Source
Next router
Previous router
Which of these is not a type of error-reporting message?
Destination unreachable
Source quench
Router error
Time exceeded
A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 1000 frames per second?
150 frames
80 frames
135 frames
96 frames
A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 250 frames per second?
38 frames
48 frames
96 frames
126 frames
In _______, the stations share the bandwidth of the channel in time.
FDMA
CDMA
TDMA
none of the above
In the _______ method, the stations in a network are organized in a logical ring.
polling
token passing
reservation
none of the above
_________ augments the CSMA algorithm to detect collision.
CSMA/CD
CSMA/CA
either (a) or (b)
both (a) and (b)
The vulnerable time for CSMA is the ________propagation time.
three times
two times
the same as above
none of the above
TDMA is a multiple access technique that has
Different users in different time slots
Each user is assigned unique frequency slots
Each user is assigned a unique code sequence
Each signal is modulated with frequency modulation technique
Frequency planning is very essential in ...........
FDMA
TDMA
FDMA & TDMA
None of the mentioned
CDMA is
1. Spread spectrum technology
2. Using same communication medium
3. every user stays at a certain narrowband channel at a specific time period
4. each user has unique PN code
1,2 and 3 are correct
2 and 3 are correct
1, 2 and 4 are correct
All the four are correct
Simple mail transfer protocol (SMTP) utilizes ____ as the transport layer protocol for electronic mail transfer.
TCP
UDP
DCCP
SCTP
SMTP uses the TCP port
22
23
24
25
DHCP (dynamic host configuration protocol) provides __________ to the client.
IP address
MAC address
Url
None of the mentioned
The DHCP server can provide the _______ of the IP addresses.
dynamic allocation
automatic allocation
static allocation
all of the mentioned
A ___________ is a packet sent by a node to the source to inform it of congestion.
backpressure
choke packet
implicit signaling
explicit signaling
In __________, there is no communication between the congested node or nodes and the source. The source guesses that there is a congestion somewhere in the network from other symptoms.
backpressure
choke packet
implicit signalling
explicit signalling
Which of the following is an example of Exterior Gateway Protocol.
Open Short Path First(OSPF)
Border Gateway Protocol(BGP)
Routing Information Protocol(RIP)
All of the above
........... allow the exchange of summary information between autonomous systems.
Interior Gateway Protocol(IGP)
Exterior Gateway Protocol(EGP)
Border Gateway Protocol(BGP)
Dynamic Gateway Protocol(DGP)
What is the difference between TCP and UDP?
TCP is connection-oriented; UDP uses acknowledgements only
TCP is connection-oriented; UDP is connectionless
Both TCP and UDP are connection-oriented, but only TCP uses windowing
TCP and UDP both have sequencing, but UDP is connectionless
The network device required to connect a Token ring network to an Ethernet network?
Repeater
NIC
Router
Token Ring to Ethernet translation hub
