Chapter 2 - Network Installation & Configuration

Question 1

NAT

name?
purpose?
where is it most often used?

2-61

Answer 1

network address translation

translate one set of IP addresses to another set of IP addresses

most often used between a private network and the internet

Question 2

PAT

name?
purpose?
contrast PAT with NAT

2-61

Answer 2

port address translation

to use port numbers to provide address translation for many inside source addresses to one outside source address

PAT-many to one
NAT-one to one

Question 3

VLAN

name?
purpose?
how does it work?

2-63

Answer 3

virtual local area network

to solve the problem of subnets being limited by physical location

switches create subnets, these subnets span multiple switches, these kinds of networks are VLANs, and special links called trunks hold all the VLANs

Question 4

draw a picture that explains the difference between full duplex and half duplex

2-63

Answer 4

full: AB, both can send AND receive at the same time
half: A -> OR

Question 5

tell me the MAC address broadcast address

what is VTP?
what does VTP allow?

2-64

Answer 5

FF-FF-FF-FF-FF-FF

VLAN trunking protocol
allows you to create a switch with the role of “server” that you can configure with your VLAN information

Question 6

QoS

name?
purpose?

2-66

Answer 6

Quality of Service

network technique that divides traffic into categories based on the protocol of the traffic, this allows for prioritization

Question 7

port mirroring

what kind of device does it and what’s the point of doing it?

2-66

Answer 7

IDS/IPS

get a copy of network packets from one switch port to another, for the purpose of monitoring the packets and logging them for security

Question 8

tell me the 2 typical frequencies used by WAP (wireless access point)

what about channels? (3 of them)

why use those channels?

2-68

Answer 8

2.4 GHz, 5 GHz

1, 6, 11

because they don’t overlap and therefore they are the least likely to interfere with each other

Question 9

what is SSID?

why would you disable it?

2-68

Answer 9

service set ID

for extra security

Question 10

reproduce table 2.2 wireless standards. (all 802.11)

standard, modulation, frequency, max speed

2-69

Answer 10

a - OFDM, 5GHz, 54Mbps
b - DSSS, 2.4GHz, 11Mbps
g - both, 2.4GHz, 54Mbps
n - both, both, 600Mbps

Question 11

tell me 4 devices you would want to statically configure an IP address for

2-70

Answer 11

server
printer
plotter
router interfaces

Question 12

what is reservation address?

what is “scope”?

2-71

Answer 12

when you configure a device to pull the same IP address from a DHCP server every time

the range of addresses that can be assigned to clients

Question 13

your client got an IP address from your DHCP server. at what point will the client attempt to renew its lease?

2-72

Answer 13

when 50% of the lease time has expired

Question 14

wireless configuration

where will you see compatibility issues?

improper placement of a WAP will cause issues with ____, ____, and ____. these things will, in turn, cause what 2 things to happen?

2-76

Answer 14

a against b/g/n

signal strength, bounce, and interference

latency of signal, poor connection

Question 15

interfaces on switches and routers are sometimes referred to as what?

MTU: name and size range for ethernet packets

2-77

Answer 15

physical ports

maximum transfer unit
64 bytes to 1518 bytes

Question 16

if you don’t configure the MTU properly on your router’s interfaces, you’ll very likely end up with a ____ ____ router.

2-77

Answer 16

black hole

Question 17

how can you ensure power to your switches and routers?
(use something)

2-78

Answer 17

use a UPS

un-interruptable power supply

Question 18

what is SFP?

what is a GBIC?

2-78

Answer 18

small form-factor pluggable, its a compact, hot-pluggable transceiver for telecommunications and data communications

gigabit interface converter, its a hot-swappable interface module and is the common standard for gigabit ethernet and fiber channel

Question 19

you are troubleshooting an IP address. what is an IP address’ “other part”?

2-78

Answer 19

subnet mask

Question 20

what does the gateway of a computer or switch determine?

2-78

Answer 20

determines how it will send data to a remote network of any kind

Question 21

for your network to function properly, you must provide a unique address for each ____ and each router ____ on the network.

2-79

Answer 21

NIC, interface

Question 22

what is “soho”?

2-80

Answer 22

small office / home office

Question 23

you have a twisted pair cable. what’s the max distance you can run it from a switch?

a switch is also a ____ ____.

define “plenum”

2-81

Answer 23

100 meters (328 feet)

multiport repeater

its the area between the ceiling of one story and the floor of the story above it in an office building

Question 24

in a soho environment, TCP/IP is the most likely protocol because it provides ____ and ____.

2-82

Answer 24

communications within the network

facilitates connecting the network to the internet

Question 25

in a soho network, what’s the usual maximum number of computers you’ll see?

2-82

Answer 25

10