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Computer Networks

Descripción

ThirdYear Third Year Test sobre Computer Networks, creado por Faheem Ahmed el 18/10/2017.
Faheem Ahmed
Test por Faheem Ahmed, actualizado hace más de 1 año
Faheem Ahmed
Creado por Faheem Ahmed hace casi 7 años
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Resumen del Recurso

Pregunta 1

Pregunta
An IPv4 address is _________ bits.
Respuesta
  • 8
  • 16
  • 32
  • 64

Pregunta 2

Pregunta
What is the class of the address 200.66.10.21?
Respuesta
  • A
  • B
  • C
  • D

Pregunta 3

Pregunta
What is the hostid of the address 12.11.1.21?
Respuesta
  • 11.1.21
  • 1.21
  • 21
  • None

Pregunta 4

Pregunta
What is the address of the network to which the host 130.8.119.1 is connected ?
Respuesta
  • 130.8.119.0
  • 130.8.0.0
  • 130.0.0.0
  • None

Pregunta 5

Pregunta
Which error detection method involves polynomials?
Respuesta
  • VRC
  • LRC
  • CRC
  • checksum

Pregunta 6

Pregunta
In cyclic redundancy checking, the divisor is _______the CRC.
Respuesta
  • the same size as
  • one bit less than
  • one bit more than
  • two bits more than

Pregunta 7

Pregunta
IPV6 address has ____________ bits.
Respuesta
  • 32
  • 64
  • 128
  • 256

Pregunta 8

Pregunta
What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
Respuesta
  • 16
  • 32
  • 62
  • 30

Pregunta 9

Pregunta
You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which will be your choice?
Respuesta
  • 255.255.255.192
  • 255.255.255.224
  • 255.255.255.240
  • 255.255.255.248

Pregunta 10

Pregunta
Which protocol does Ping use?
Respuesta
  • TCP
  • ARP
  • ICMP
  • DHCP

Pregunta 11

Pregunta
Which class of IP address provides a maximum of only 254 host addresses per network ID?
Respuesta
  • A
  • B
  • C
  • D
  • E

Pregunta 12

Pregunta
Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?
Respuesta
  • Hub
  • Switch
  • Router
  • Bridge

Pregunta 13

Pregunta
HUB is a _________ Device and Switch is a ________ Device.
Respuesta
  • Unicast, Multicast
  • Multicast, Unicast
  • Broadcast, Unicast
  • Unicast, Broadcast

Pregunta 14

Pregunta
The last address of IP address represents
Respuesta
  • Unicast address
  • Network address
  • Broadcast address
  • Multicast address

Pregunta 15

Pregunta
DNS stands for
Respuesta
  • Dynamic Name System
  • Dynamic Network System
  • Domain Name System
  • Domain Network Service

Pregunta 16

Pregunta
What is the size of MAC address?
Respuesta
  • 16 bits
  • 32 bits
  • 48 bits
  • 64 bits

Pregunta 17

Pregunta
What is the size of host bits in Class B of IP address?
Respuesta
  • 4
  • 8
  • 16
  • 32

Pregunta 18

Pregunta
What is the usable size of network bits in Class B of IP address?
Respuesta
  • 4
  • 8
  • 14
  • 16

Pregunta 19

Pregunta
Which of the following is/are protocols of Application?
Respuesta
  • FTP
  • DNS
  • Telnet
  • All the above.

Pregunta 20

Pregunta
Default administrative distance of Static Route
Respuesta
  • 0
  • 1
  • 10
  • 90
  • 100

Pregunta 21

Pregunta
Which protocol working at the Transport layer provides a connectionless service between hosts?
Respuesta
  • IP
  • ARP
  • TCP
  • UDP

Pregunta 22

Pregunta
What protocol is used to find the hardware address of a local device?
Respuesta
  • DNS
  • ARP
  • IP
  • ICMP

Pregunta 23

Pregunta
A router ?
Respuesta
  • forwards a packet to all outgoing links.
  • forwards a packet to all outgoing links, except the link upon which the packet originated
  • forwards a packet to the next free outgoing link
  • determines on which outgoing link a packet is to be forwarded.

Pregunta 24

Pregunta
Which command does not show that two devices are failing to route packets between them successfully?
Respuesta
  • show interface
  • trace
  • telnet
  • ping

Pregunta 25

Pregunta
Which of the following ranges are considered well-known port numbers?
Respuesta
  • 1–1023
  • 1024 and above
  • 1–256
  • 1–65534

Pregunta 26

Pregunta
Which protocol does DHCP use at the Transport layer?
Respuesta
  • IP
  • TCP
  • UDP
  • ARP

Pregunta 27

Pregunta
Which class of IP address has the most host addresses available by default?
Respuesta
  • A
  • B
  • C
  • D

Pregunta 28

Pregunta
What does the command ip route 192.168.50.0 255.255.255.0 10.2.1.3 specify?
Respuesta
  • The router should use network 192.168.50.0 to get to address 10.2.1.3
  • Both 192.168.50.0 and 10.2.1.3 use a mask of 255.255.255.0
  • You want the router to trace a route to network 192.168.50.0 via 10.2.1.3
  • The router should use address 10.2.1.3 to get to devices on network 192.168.50.0

Pregunta 29

Pregunta
Match the following: A. Repeaters 1. Data Link Layer B. Bridges 2. Network Layer C. Routers 3. Physical Layer
Respuesta
  • A --->2, B--->3, C--->1
  • A--->3, B---->1, C---->2
  • A--->3, B----->2, C---->1
  • A---->1, B---->2, C---->3

Pregunta 30

Pregunta
Which of the following is true of a Switch?
Respuesta
  • Switches forward packets based on IP address.
  • Switches forward packets based on MAC address.
  • Switches forward packets based on IPX address.
  • Switches forward packets based on Layer 3 address.

Pregunta 31

Pregunta
A client workstation is connected to a DHCP server through a switch and a router, The client machine has been able to access the network resources without any problem. However, after the recent configuration change on the DHCP server, the client workstation is not able to access any network resources. What is the likely solution.
Respuesta
  • Clear arp cache on the router
  • Use ipconfig command with /release and /renew options
  • Reset switch MAC address table
  • Issue a tracert command to DHCP server

Pregunta 32

Pregunta
Match the following: 1. Segments A. Data Link Layer 2. Packets B. Network Layer 3. Frames C. Transport Layer
Respuesta
  • 1--->A; 2---->C; 3 --->B
  • 1--->C; 2---->A; 3 --->B
  • 1--->C; 2---->B; 3 --->A
  • 1--->A; 2---->B; 3 --->C

Pregunta 33

Pregunta
Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2? 1. The command is used to establish a static route. 2. The default administrative distance is used. 3. The command is used to configure the default route. 4. The subnet mask for the source address is 255.255.255.0.
Respuesta
  • 1 and 2
  • 2 and 4
  • 3 and 4
  • All of the above

Pregunta 34

Pregunta
If your routing table has a static, a RIP, and an IGRP route to the same network, which route will be used to route packets by default?
Respuesta
  • Any available route
  • RIP route
  • Static route
  • IGRP route
  • They will all load-balance.

Pregunta 35

Pregunta
A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?
Respuesta
  • IGRP has a faster update timer.
  • IGRP has a lower administrative distance.
  • RIP has a higher metric value for that route.
  • The IGRP route has fewer hops.

Pregunta 36

Pregunta
Start and stop bits are used in serial communication for
Respuesta
  • Error detection
  • Error correction
  • Synchronization
  • Slowing down the communication

Pregunta 37

Pregunta
How many Character per sec (7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?
Respuesta
  • 300
  • 240
  • 250
  • 24

Pregunta 38

Pregunta
The Network topology that supports bi-directional links between each possible node is
Respuesta
  • Ring
  • Star
  • Tree
  • Mesh

Pregunta 39

Pregunta
In a broad Sense, a railway track is an example of
Respuesta
  • Simplex
  • Half Duplex
  • Full Duplex
  • All of these

Pregunta 40

Pregunta
If one link fails, only that link is affected. All other links remain active. Which topology does this?
Respuesta
  • Mesh topology
  • Star topology
  • Bus topology
  • Physical topology

Pregunta 41

Pregunta
Which command would you place on interface connected to the Internet?
Respuesta
  • ip nat inside
  • ip nat outside
  • ip outside global
  • ip inside local

Pregunta 42

Pregunta
Which command would you place on interface on a private network?
Respuesta
  • ip nat inside
  • ip nat outside
  • ip outside global
  • ip inside local

Pregunta 43

Pregunta
What is the administrative distance of OSPF?
Respuesta
  • 90
  • 100
  • 110
  • 120

Pregunta 44

Pregunta
Which three commands can be used to check LAN connectivity problems on a router? (Select THREE )
Respuesta
  • show interfaces
  • show ip route
  • tracert
  • ping
  • dns lookups

Pregunta 45

Pregunta
You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?
Respuesta
  • 6
  • 8
  • 30
  • 32

Pregunta 46

Pregunta
What is the sub network number of a host with an IP address of 172.16.66.0/21?
Respuesta
  • 172.16.36.0
  • 172.16.48.0
  • 172.16.64.0
  • 172.16.0.0

Pregunta 47

Pregunta
The network address of 172.16.0.0/19 provides how many subnets and hosts?
Respuesta
  • 7 subnets, 30 hosts each
  • 8 subnets, 8,190 hosts each
  • 8 subnets, 2,046 hosts each
  • 7 subnets, 2,046 hosts each

Pregunta 48

Pregunta
On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?
Respuesta
  • /27
  • /28
  • /29
  • /30

Pregunta 49

Pregunta
When data is encapsulated, which is the correct order?
Respuesta
  • Data, frame, packet, segment, bit
  • Segment, data, packet, frame, bit
  • Data, segment, packet, frame, bit
  • Data, segment, frame, packet, bit

Pregunta 50

Pregunta
If you use either Telnet or FTP, which is the highest layer you are using to transmit data?
Respuesta
  • Application
  • Presentation
  • Session
  • Transport
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