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networking > Switches and Routers > Flashcards

Switches and Routers Flashcards

1
Q

A network switch is the central connection point for ____ plugging into the network.

A

devices

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2
Q

Which device is used to repeat and generate network signals?

A

hub

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3
Q

What does every network card have burned into it?

A

MAC address

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4
Q

What does ASIC stand for?

A

Application Specific Integrated Circuit

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5
Q

Cisco ______ combines multiple switches into one for ease of management.

A

stackwise

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6
Q

_______ is used to gain more ports across multiple switches.

A

daisy-chain

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7
Q

What does CAM stand for?

A

content accessible memory

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8
Q

What is a unicast address?

A

directed to one interface/device

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9
Q

Which device connects dissimilar networks?

A

router

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10
Q

What does IOS stand for?

A

internetwork operating system

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11
Q

Are routers software or hardware based?

A

software

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12
Q

Are ASICs software or hardware based?

A

hardware

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13
Q

Lower frequencies have a _____ range than high frequencies.

A

higher

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14
Q

What does WAP stand for?

A

wireless access point

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15
Q

What frequencies does WAPs broadcast on?

A

2.4 Ghz and 5 Ghz

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16
Q

How many channels exist on a 2.4 Ghz frequency?

A

11

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17
Q

How many clean channels does a 2.4 Ghz frequency have?

A

3 (1, 6, 11)

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18
Q

What is the purpose of a controller?

A

manage multiple WAP configurations

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19
Q

Which frequency provides more channels? 2.4 Ghz or 5 Ghz?

A

5 Ghz

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20
Q

True or False: A router can perform basic firewall functions.

A

True

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21
Q

True or False: A firewall can perform routing functions.

A

True

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22
Q

What is transparent mode on a firewall?

A

Firewall does not break up the network.

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23
Q

What is routed mode on a firewall?

A

Firewall divides the network

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24
Q

What is stateful filtering?

A

By default traffic is allowed to move from a higher security zone to a lower zone

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25
Q

On a scale of level 0 to level 100, which value has the highest level security?

A

100

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26
Q

True or False: A router allows by default and denies by exception.

A

True

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27
Q

True or False: A firewall allows by default and denies by exception.

A

False

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28
Q

True or False: A firewall denies everything by default and allows by exception.

A

True

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29
Q

What is an IPS?

A

intrusion prevention system

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30
Q

What are the two methods IPS detect intrusions?

A

anomaly based or signature based

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31
Q

Which areas of the network are bottleneck areas?

A

internet and WAN

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32
Q

What is the speed of a T1 line?

A

1.54 mbps

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33
Q

What is EtherChannel within Cisco?

A

grouping several Ethernet links to create one logical link

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34
Q

What is the benefit of EtherChannel within Cisco?

A

fault tolerance and high speed links

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35
Q

What does CSMA/CD stand for?

A

carrier sense multiple access / collision detection

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36
Q

True or False: WAPs possess CSMA/CD capabilities.

A

False

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37
Q

What do WAPs use in place of CSMA/CD?

A

CSMA/CA (collision avoidance)

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38
Q

A data transfer rate is measured at 100 Mbps. What does Mbps stand for?

A

Megabits per second

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39
Q

What is a MDF?

A

Main distribution facility?

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40
Q

What is an IDF?

A

Intermediate distribution facility

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41
Q

What is the purpose of a MDF?

A

central location where all cabling terminates

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42
Q

What is the effective distance of Ethernet?

A

100 meters

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43
Q

What is the difference between multimode and single mode fiber?

A

multimode transmits up to 500m

single mode fiber is used for longer distances

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44
Q

What does CAT3, CAT4, CAT5, CAT6, etc. refer to?

A

cable twists, tighter twists

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45
Q

What are UTP cables?

A

unshielded twisted pair cables (ethernet)

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46
Q

What are straight-through cables used for?

A

unlike devices

e. g. router to switch
e. g. NIC to switch

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47
Q

What does pin 1 connect to on a straight-through cable?

A

pin 3

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48
Q

What does pin 2 connect to on a straight-through cable?

A

pin 6

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49
Q

What does Auto MDIX provide for cables?

A

recognizes cable pin-outs and auto configures

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50
Q

What are crossover cables used for?

A

like devices

e. g. router to router
e. g. switch to switch

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51
Q

What are serial cables used for?

A

WAN, long distance

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52
Q

What are the three topologies for networks?

A

star, mesh, hybrid

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53
Q

Which topologies are setup for redundancy?

A

mesh, hybrid

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54
Q

What is unicast?

A

one to one

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55
Q

What is multicast?

A

one to many

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56
Q

What is broadcast?

A

one to all

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57
Q

What is anycast?

A

one to closest, nearest

58
Q

What stream mode does MOH (music on hold) use?

A

multicast

59
Q

When imaging multiple devices, what stream mode is used (preferably)?

A

multicast

60
Q

What does DHCP stand for?

A

dynamic host configuration protocol

61
Q

What is the function of DHCP?

A

dynamically assign IP addresses

62
Q

What does ARP stand for?

A

address resolution protocol

63
Q

What is the function of ARP?

A

resolves IP addresses into MAC addresses

64
Q

Which internet protocol uses anycast?

A

IPv6

65
Q

When are broadcast messages used?

A

ARP, DHCP, RIP

Used to gather or distribute information

66
Q

How many hosts can you have with a Class C address?

A

254 hosts

67
Q

What is used to translate a name into an IP address?

A

DNS

68
Q

What is RFC1918?

A

private IPv4 address spaces

69
Q

What is NAT?

A

network address translation

translates private IP to public IP

70
Q

If an address falls under 172.16.0.0 - 172.31.255.255, what class is it?

A

private IPv4

71
Q

If an address falls under 192.168.0.0 - 192.168.255.255, what class is it?

A

private IPv4

72
Q

If an address falls under 10.0.0.0 - 10.255.255.255, what class is it?

A

private IPv4

73
Q

What is the default time on an ARP cache?

A

5 minutes

74
Q

Within a packet, the destination MAC address is usually associated to which device?

A

router (default gateway)

75
Q

True or False: IP addresses and MAC addresses are required to send packets.

A

True

76
Q

A computer generates an HTTP request to CBTNuggets.com. When going through the encapsulation process, what is added closest to the originating HTTP GET message from the computer?

A

source and destination IP address

77
Q

When a computer doesn’t know the MAC address of its default gateway, what does it do to find out?

A

send ARP message

78
Q

What does the router do when it receives a packet destined for another network?

A

replaces source and destination MAC address

79
Q

Between TCP and UDP, which is a reliable connection?

A

TCP

80
Q

What protocol does ping work over?

A

ICMP (internet control message protocol)

81
Q

What are the steps of the TCP three-way handshake?

A

SYN, SYN/ACK, ACK

82
Q

Which transmission protocol is associated with real-time transfers?

A

UDP

83
Q

Which transmission protocol is session based?

A

TCP

84
Q

What is TCP sliding window?

A

adjustment of data sent before it is acknowledged from sender and receiver

85
Q

What does the command nslookup do?

A

verify DNS records

86
Q

What are two useful reasons for using Telnet?

A

device management and to verify open ports

87
Q

What is the access layer of the Cisco model?

A

where devices connect to switches

88
Q

What is the distribution layer of the Cisco model?

A

redundancy for the access layer

89
Q

What is the core layer of the Cisco model?

A

connect multiple distribution layers

90
Q

Which layer in the three-tiered Cisco model provides connectivity to all access-layer switches?

A

distribution

91
Q

What is the most common model in the Hierarchical Network Design?

A

access layer

92
Q

What is the most common model in the Hierarchical Network Design?

A

collapsed core model

93
Q

What is unique about the design of the collapsed core network model?

A

the distribution and core layer are implemented by a single device

94
Q

What three layers refer to as the “computer layers” that are typically not inspected or modified by network devices?

A

session, presentation, application

95
Q

What does the command netstat do?

A

display all active connections

96
Q

What layer is the FCS/CRC added?

A

layer 2 (data link)

97
Q

Which UDP port is used by DNS services?

A

53

98
Q

Every IOS version is platform-specific. True or false?

A

True

99
Q

To assist in controlling Cisco devices, the Internetwork Operating System (IOS) command line is _____ sensitive.

A

context

100
Q

What are the three ways you can access the command line in IOS?

A

console port, telnet, SSH

101
Q

What program can you use to create scripts for command line?

A

notepad

102
Q

What application can you use to view what COM port is used?

A

device manager

103
Q

The pinouts for the console cable are _______.

A

rolled

104
Q

What are the default values for serial line?

A

9600 8N1 N

105
Q

What does 9600 8N1 N refer to?

A

speed(baud), data bits, stop bits, parity(flow control)

106
Q

Which symbol is an easy way to identify that you are in user mode?

A

>

107
Q

What symbol identifies that you are in privilege mode?

A

#

108
Q

What type of notification message is displayed when you do not have a configuration saved on your Cisco device?

A

syslog message

109
Q

What command is used to enter console mode?

A

line console 0

110
Q

What command is used to enter privilege mode?

A

enable

111
Q

What command is used to enter global configuration mode?

A

configuration terminal

112
Q

What command can be used to move from a high level to a lower level? (config to enable mode)

A

exit

113
Q

What command can be used to move directly back to privilege mode?

A

end or ctrl+z

114
Q

What command can be used to view interfaces?

A

show ip interface

show ip interface brief

115
Q

When you are under line console 0 or line vty 0 15, what does the logging synchronous command do?

A

It will move your config prompt to the next line when a system message is displayed

116
Q

What does the command no ip domain-lookup do?

A

Prevents domain lookup for IOS input

117
Q

What command can be used to view saved configurations?

A

show flash

118
Q

What command can be used to view configurations stored on RAM?

A

show running-config

show run

119
Q

What command can be used to view configurations stored on NVRAM?

A

show startup-config

show start

120
Q

What command will save your current configuration to startup?

A

copy running-config startup-config

copy run start

121
Q

What command will erase the NVRAM or reset to factory settings?

A

write erase

122
Q

How do you erase the running config?

A

reboot the device

123
Q

What command can be used to save your current configuration to a tftp server?

A

copy running-config tftp

124
Q

What command can be used to assign an ip address?

A

ip address (ip address) (subnet mask)

125
Q

What command can be used to set ip address to dhcp?

A

ip address dhcp

126
Q

What command can be used to encrypt passwords?

A

service password-encryption

127
Q

What command can be used to hash passwords?

A

secret

128
Q

When logging in with console or Telnet, what is the banner sequence?

A

MOTD, login, user login, exec

129
Q

When logging in with SSH, what is the banner sequence?

A

login, user login, MOTD, exec

130
Q

Under which file name is all VLAN information stored?

A

vlan.dat

131
Q

If a device displays, “Would you like to enter the initial configuration dialog?” what can you assume about the device?

A

NVRAM is cleared

132
Q

Where do you assign the IP address on a switch for telnet or SSH?

A

vlan1

133
Q

What command will generate the RSA encryption keys needed for SSH and HTTPS device management?

A

crypto key generate rsa

134
Q

If you change the domain name of a Cisco device after the RSA has been generated, the encryption will not be affected. True or false?

A

False

135
Q

Which command will configure all SSH and Telnet ports at the same time?

A

line vty 0 4

136
Q

Within a switch interface, if the status of an interface is down, this indicates that there may be an issue with what layer?

A

layer 1, physical

137
Q

Within a switch interface, if the protocol of an interface is down, this indicates that there may be an issue with what layer?

A

layer 2, data link

138
Q

For the switch interface FastEthernet 0/0/0, what does Fast Ethernet refer to?

A

Type

139
Q

For the switch interface FastEthernet 0/0/0, what does 0/0/0 refer to?

A

blade/module/port

140
Q

What type of cable allows you to stack switches together to act as one?

A

stackwise cable

141
Q

What is the command to prevent your device from looking up mistyped privileged mode commands via DNS?

A

no ip domain-lookup

networking (9 decks)

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