Friday, February 10, 2012

NETWORKING chapter2

SG Network Hardware Essentials
Chapter 2

TRUE/FALSE

     1.   When a NIC is in “promiscuous” mode, it will process only the frames in which the destination MAC address matches its own MAC address.

     2.   Routers do not forward broadcast packets.

     3.   If a router receives a packet and it does not have an entry in its routing table for the destination network, it will send the packet to its default route, if configured.

     4.   The function of a repeater is to extend the range of an existing network.

     5.   You cannot connect a hub to another hub unless it has an uplink port.

MULTIPLE CHOICE

     1.   When a frame is received, which component reads the source and destination MAC addresses, looks up the destination to determine where to send the frame, and forwards it out the correct port?

a.
router
b.
switch
c.
repeater
d.
hub


     2.   Why would you need to use a repeater?

a.
You need to connect two networks together to make an internetwork.
b.
Your network is too large, and you need to decrease the size of the broadcast domain.
c.
You want to maximize the available bandwidth.
d.
You need to add a group of computers to your network, and the distance is too far for normal means of communication.


     3.   Which of the following is NOT a function of a hub?

a.
cleans up the signal
b.
transmits the signal to the correct port
c.
receives the signal from a connected computer on one of its ports
d.
regenerates the signal


     4.   How does a switch “learn” MAC addresses?

a.
All the MAC addresses must be entered manually.
b.
The switch comes loaded with the most frequently used addresses.
c.
The switch reads each frame and makes a note of where each MAC address came from.
d.
The switch uses a mathematical formula to determine what the MAC address would be for each computer connected to it.


     5.   Why is the use of a switch preferred over a hub?

a.
Devices on a hub have to share the available bandwidth.
b.
Switches are intelligent; they read the frame and determine where to send it.
c.
Switches can operate in full-duplex mode.
d.
All of the above.


     6.   What does a switch store in its switching table?

a.
the source MAC address of a frame and the port it was received on
b.
the destination MAC address of a frame and the port it was received on
c.
the source IP address of a frame and the port it was received on
d.
the destination IP address of a frame and the port it was received on


     7.   What is a packet called that is intended for only one individual computer?

a.
broadcast
b.
unicast
c.
multicast
d.
anycast


     8.   Just as a switch keeps records of MAC addresses that it has learned, so does your computer. What protocol does your computer use to learn MAC addresses?

a.
ARP
b.
ICMP
c.
DHCP
d.
IP


     9.   What does it usually mean when the activity light on a switch is blinking?

a.
It is malfunctioning.
b.
It is ready to receive data.
c.
It is communicating with the network.
d.
A collision is imminent.


   10.   What component of the computer provides it with a MAC address?
a.
motherboard
b.
NIC
c.
CPU
d.
BIOS


   11.   A MAC address is composed of two 24-bit numbers. What does the first 24-bit number represent?

a.
It’s a unique serial number assigned by the manufacturer.
b.
It’s the address it uses for a multicast packet.
c.
It’s the decryption key used for security purposes.
d.
It’s the organizationally unique identifier for the manufacturer of the device.


   12.   What command issued from the command prompt will show the route that a packet travels from the issuing computer to another computer?

a.
route
b.
tracert
c.
ipconfig
d.
arp


   13.   What is the purpose of the default route?

a.
It serves as a guideline for how to configure routes.
b.
It’s a route set by Microsoft so that all information comes to their servers first.
c.
It’s where the router sends all packets with destinations of which it has no knowledge.
d.
None of the above


   14.   A wireless access point is most like which other network device, in that all computers send signals through it to communicate with other computers?

a.
switch
b.
router
c.
hub
d.
modem


   15.   When referring to network bandwidth, what is the basic unit of measurement?

a.
bytes per second
b.
bits per second
c.
bandwidth per second
d.
bytes per minute


   16.   Before a computer can transmit data on a wireless network in some cases, it must send What type of signal to the AP?

a.
RTS
b.
ARP
c.
CTS
d.
DNS


   17.   The SSID is configured on which of the following so that it can be distinguished from other available wireless networks?

a.
router
b.
access point
c.
switch
d.
repeater


   18.   What command would you issue from the command prompt to test whether your computer has connectivity to the network?

a.
ping IPaddress
b.
arp -d IPaddress
c.
ipconfig IPaddress
d.
ipconfig /all


MULTIPLE RESPONSE

     1.   Which of the following are features of a router? (Choose all that apply)

a.
connects computers to the LAN
b.
connects LANs to one another
c.
works with MAC addresses
d.
forwards broadcast packets
e.
works with packets instead of frames


     2.   What type of indicator lights would you find on a hub?

a.
network activity
b.
link status
c.
signal strength
d.
uplink
e.
collision


COMPLETION

     1.   The “Locally Administered Address” can be used to override the burned-in __________ address.

     2.   In a computer’s IP address settings, the _____________ gateway is the address of the router to which a computer sends all packets that are intended for networks outside of its own.

     3.   A __________ frame is a message that is intended to be processed by all devices on the LAN.

     4.   The network ____________ is a measurement of the amount of data that can pass through a network in a certain period of time.

     5.   A switch operating in ___________ mode can send and receive data at the same time.

MATCHING

Match each item with a statement below:
a.
switch
b.
hub
c.
half-duplex mode
d.
router
e.
bandwidth sharing
f.
repeater
g.
dedicated bandwidth
h.
network interface card
i.
access point
j.
network bandwidth


     1.   device that uses MAC addresses to determine the destination of frame

     2.   device that connects LANs

     3.   device that connects a computer with the network medium

     4.   device that only regenerates incoming signals

     5.   communication in which a device can send and receive signals but not at the same time

     6.   device that connects wireless computers

     7.   device that connects multiple computers but regenerates signals out all ports

     8.   amount of data that can be transferred on a network

     9.   how devices connected to a hub use network bandwidth

   10.   how devices connected to a switch use network bandwidth

            SHORT ANSWER

     1.   Why is the NIC considered the “gatekeeper”?

     2.   What are the major differences between a hub and a switch?

     3.   List the steps that a switch performs for each frame.

     4.   What is a broadcast frame?

     5.   What is the difference between a switch and a router?

     6.   What does a router keep in its routing table?

     7.   What is the importance of a default route?

     8.   What is a default gateway?

     9.   What are the major tasks that a NIC performs?

   10.   What is the MAC address of a computer?

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