OBJECTIVE QUESTIONS AND ANSWERS

$1.$ The OSI model has $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$layers.

A$.5$

B$.5$

C$.6$

D$.7$

$2.$ The TCP$/$IP model does not have $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ layer but the OSI model has this layer.

A$.$ application layer

B$.$ none of the above

C$.$ session layer

D$.$ transport layer

$3.$ Which layer links the network support layers and user support layers?

A$.$ Data link layer

B$.$ Network layer

C$.$ Session layer

D$.$ Transport layer

$4.$ Which of the following is used for web communication and secure web browsing?

A$.$ DNS $($Domain Name System$)$

B$.$ HTTP$/$HTTPS

C$.$ SMTP$/$POP$3/$IMAP

D$.$ TCP$/$IP protocols

$5.$ Which address identifies a process on a host?

A$.$ Logical address

B$.$ Network address

C$.$ Port address

D$.$ Physical address

$6.$ The data link layer takes the packets from $\_\_\_\_\_\_\_\_$and encapsulates them into frames for transmission.

A$.$ application layer

B$.$ network layer

C$.$ physical layer

D$.$ transport layer

$7.$ Which sublayer of the data link layer performs data link functions that depend upon the type of medium?

A$.$ Logical link control sublayer

B$.$ Media access control sublayer

C$.$ Network interface control sublayer

D$.$ None of the above

$8.$ The physical layer is concerned with$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

A$.$ application to application delivery

B$.$ bit$-$by$-$bit delivery

C$.$ none of the above

D$.$ process to process delivery

$9.$ The portion of the physical layer that interfaces with the media access control sublayer is called:

A$.$ network address sublayer

B$.$ physical signaling sublayer

C$.$ physical data sublayer

D$.$ physical address sublayer

$10.$ Which one of the following is not a function of the network layer?

A$.$ congestion control

B$.$ inter$-$networking

C$.$ none of the above

D$.$ routing

$11.$ The $4-$byte IP address consists of$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

A$.$ both network address and host address

B$.$ host address

C$.$ media address and host address

D$.$ network address

$12.$ Which of these is not applicable to IP protocol?

A$.$ connectionless

B$.$ offer reliable service

C$.$ offer unreliable service

D$.$ offers both reliable and unreliable service

$13.$ In classless addressing, there are no classes but addresses are still granted in$........$

A$.$ Blocks

B$.$ Codes

C$.$ IPs

D$.$ Sizes

$14.$ Which of the following is used to resolve domain names with regard to IP addresses?

E$.$ DNS $($Domain Name System$)$

F$.$ HTTP$/$HTTPS

G$.$ SMTP$/$POP$3/$IMAP

H$.$ TCP$/$IP protocols

$15.$ In IPv$4$ Addresses, classful addressing is replaced with

A$.$ classless Addressing

B$.$ classful Addressing

C$.$ classful Advertising

D$.$ classless Advertising

$16.$ The first address in a block is used as the network address that represents the$\_\_\_\_\_\_\_\_\_\_\_$

A$.$ class Network

B$.$ entity

C$.$ host

D$.$ organization

$17.$ A $\_\_\_\_\_\_\_\_$ is a multiport connectivity device that directs data between nodes on different networks.

A$.$ Bridge

B$.$ Gateway

C$.$ Router

D$.$ Switch

$18.$ Which of the following is the broadcast address for a class B network ID using the default Subnetmask?

A$.172\mathrm{.}16\mathrm{.}10\mathrm{.}255$

B$.255\mathrm{.}255\mathrm{.}255\mathrm{.}255$

C$.172\mathrm{.}16\mathrm{.}255\mathrm{.}255$

D$.172\mathrm{.}255\mathrm{.}255\mathrm{.}255$

$19.$ You have an IP address of $172\mathrm{.}16\mathrm{.}13\mathrm{.}5$ with a $255\mathrm{.}255\mathrm{.}255\mathrm{.}128$ subnet mask. What is your class of address, subnet address, and broadcast address?

A$.$ Class A$,$ Subnet $172\mathrm{.}16\mathrm{.}13\mathrm{.}0,$ Broadcast address $172\mathrm{.}16\mathrm{.}13\mathrm{.}127$

B$.$ Class B$,$ Subnet $172\mathrm{.}16\mathrm{.}13\mathrm{.}0,$ Broadcast address $172\mathrm{.}16\mathrm{.}13\mathrm{.}127$

C$.$ Class B$,$ Subnet $172\mathrm{.}16\mathrm{.}13\mathrm{.}0,$ Broadcast address $172\mathrm{.}16\mathrm{.}13\mathrm{.}255$

D$.$ Class B$,$ Subnet $172\mathrm{.}16\mathrm{.}0\mathrm{.}0,$ Broadcast address $172\mathrm{.}16\mathrm{.}255\mathrm{.}255$

$20.$ If you wanted to have $12$ subnets with a Class C network ID$,$ which subnet mask would you use?

A$.255\mathrm{.}255\mathrm{.}255\mathrm{.}252$

B$.255\mathrm{.}255\mathrm{.}255\mathrm{.}255$

C$.255\mathrm{.}255\mathrm{.}255\mathrm{.}240$

D$.255\mathrm{.}255\mathrm{.}255\mathrm{.}248$

$..$

$21.$ Which of the following is used for Internet communication.?

I. DNS $($Domain Name System$)$

J$.$ HTTP$/$HTTPS

K$.$ SMTP$/$POP$3/$IMAP

L$.$ TCP$/$IP protocols

$22.$ Your router has the following IP address on Ethernet$0$: $172\mathrm{.}16\mathrm{.}2\mathrm{.}1/23.$ Which of the following can be valid host IDs on the LAN interface attached to the router?

i$.172\mathrm{.}16\mathrm{.}1\mathrm{.}100$

ii$.172\mathrm{.}16\mathrm{.}1\mathrm{.}198$

iii. $172\mathrm{.}16\mathrm{.}2\mathrm{.}255$

iv$.172\mathrm{.}16\mathrm{.}3\mathrm{.}0$

A$.$ i only

B$.$ ii and iii only

C$.$ iii and iv only

D$.$ None of the mentioned

$23.$ If an Ethernet port on a router were assigned an IP address of $172\mathrm{.}16\mathrm{.}112\mathrm{.}1/25,$ what would be the valid subnet address of this host?

A$.172\mathrm{.}16\mathrm{.}112\mathrm{.}0$

B$.172\mathrm{.}16\mathrm{.}0\mathrm{.}0$

C$.172\mathrm{.}16\mathrm{.}96\mathrm{.}0$

D$.172\mathrm{.}16\mathrm{.}255\mathrm{.}0$

$24.$ The network address of $172\mathrm{.}16\mathrm{.}0\mathrm{.}0/19$ provides how many subnets and hosts?

A$.7$ subnets, $30$ hosts each

B$.8$ subnets, $8,190$ hosts each

C$.8$ subnets, $2,046$ hosts each

D$.7$ subnets, $2,046$ hosts each

$...$

$25.$ On an Ethernet network, a $\_\_\_\_\_\_\_\_\_\_\_$ is the segment of the network where collisions occur if two nodes transmit data simultaneously.

A$.$ Collision domain

B$.$ Crash domain

C$.$ Duplicate domain

D$.$ Interference domain

$26.$ A $\_\_\_\_\_\_\_\_$ is a multiport connectivity device that directs data between nodes on a Local Area networks.

E$.$ Bridge

F$.$ Gateway

G$.$ Switch

H$.$ TCP$/$IP

$27.$ System administration consist of how many meta principles$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

A$.2$

B$.3$

C$.4$

D$.5$