Ccent Memory Tables

Front 1

{Ch. 2} Same-layer interactions on different computers

Back 1

The two computers use a protocol to communicate with the same layer on another computer. The protocol defined by each layer uses a header that is transmitted between the computers, to communicate what each computer wants to do

Front 2

[Ch. 2] Adjacent-layer interaction on the same computer

Back 2

On a single computer, one layer provides a service to a higher layer. The software or hardware that implements the higher layer requests that the next lower layer perform the needed function

Front 3

[Ch. 2] Name this OSI layer: Defines the format and organization of data. Includes encryption

Back 3

Presentation layer

Front 4

[Ch. 2] Name this OSI layer: Interfaces between network and application software. Also includes authentication services

Back 4

Application layer

Front 5

[Ch. 2] Name this OSI layer: Logical addressing, routing and path determination

Back 5

Network Layer

Front 6

[Ch. 2] Name this OSI layer: Defines the electrical, optical, cabling, connectors, and procedural details required for transmitting bits, represented as some form of energy passing over a physical medium

Back 6

Physical layer

Front 7

[Ch. 2] Name this OSI layer: Formats data into frames appropriate for transmission onto some physical medium. Defines rules for when the medium can be used. Defines means by which to recognize transmission errors

Back 7

Data-Link layer

Front 8

[Ch. 2] Name this OSI layer; Establishes and maintains end-to-end bidirectional flows between endpoints. Includes managing transaction flows

Back 8

Session Layer

Front 9

[Ch. 2] Name this OSI layer: Provides a variety of services between two host computers, including connection establishment and termination, flow control, error recovery, and segmentation of large data blocks into smaller parts for transmission

Back 9

Transport Layer

Front 10

[Ch. 3] Name Ethernet's speed, alternate name, IEEE standard, and cable type (including max length)

Back 10

speed = 10 Mbps
Alt Name = 10BASE-T
IEEE Standard = 802.3
Cabling = Copper (100 m)

Front 11

[Ch. 3] Name Fast Ethernet's: speed, alternate name, IEEE standard, and cable type (including max length)

Back 11

speed = 100 Mbps
Alt Name = 100BASE-TX
IEEE standard = 802.3u
Cabling = Copper (100 m)

Front 12

[Ch. 3} Name Gigabit Ethernet's: speed, alternate name, IEEE standard, and cable type (including max length)

Back 12

speed = 1000 Mbps
Alt Name = 1000BASE-LX
1000BASE-SX
IEEE standard = 802.3z
Cabling (LX) = Fiber (5 km)
Cabling (SX) = Fiber (550 m)

Front 13

[Ch. 3} What are some other names for MAC addresses?

Back 13

Ethernet address, NIC address, LAN address

Front 14

[Ch. 3] What is a burned-in address?

Back 14

6-byte address assigned by the vendor making the Network interface card

Front 15

[Ch. 3] What is a unicast addresss?

Back 15

A term for a MAC that represents a single LAN interface

Front 16

[Ch. 3] Broadcast address

Back 16

An address that means "all devices that reside on this LAN right now"

Front 17

[Ch. 3] Multicast address

Back 17

On Ethernet, a multicast address implies some subset of all devices currently on the Ethernet LAN

Front 18

[Ch. 4] What is the bit rate of a WAN DSO line?

Back 18

64 Kbps

Front 19

[Ch. 4] Bit rate of a DS1 (T1)

Back 19

1.544 Mbps (24 DSOs, plus 8 kb/s overhead)

Front 20

[Ch. 4] Bit rate of a DS3 (T3)

Back 20

44.736 Mbps (28 DS1s, plus mgmt overhead)

Front 21

[Ch. 4] Bit rate of E1

Back 21

2.048 Mbps (32 DSOs)

Front 22

[Ch. 4] Bit rate of E3

Back 22

34.064 Mbps (16 E1s, plus mgmt overhead)

Front 23

[Ch. 4] Bit rate of J1 (Y1)

Back 23

2.048 Mbps (32 DSOs, Japanese standard)

Front 24

[Ch. 5] Class A network: number of network bytes, host bytes, and addresses per network

Back 24

network bytes = 1 (8 bits)
host bytes = 3 (24 bits)
Addresses/network = 2^24-2

Front 25

[Ch. 5] Class B network: number of network bytes, host bytes, and addresses per network

Back 25

network bytes = 2 (16 bits)
host bytes = 2 (16 bits)
Addresses/network = 2^16-2

Front 26

[Ch. 5] Class C network: number of network bytes, host bytes, and addresses per network

Back 26

network bytes = 3 (24 bits)
host bytes = 1 (8 bits)
Addresses/Network = 2^8-2

Front 27

[Ch. 5] Class A network: first octet range, valid network numbers, total number for this class of network, number of hosts per network

Back 27

First octet range = 1 to 126
Valid Network Numbers = 1.0.0.0 - 126.0.0.0
Total number for class of network = 2^7-2 (126)
Total number of hosts = 2^24-2

Front 28

[Ch. 5] Class B network: first octet range, valid network numbers, total number for this class of network, number of hosts per network

Back 28

First octet range = 128 to 191
Valid Network Numbers = 128.1.0.0 - 191.254.0.0
Total number for class of network = 2^14 (16384)
Total number of hosts = 2^16-2

Front 29

[Ch. 5] Class C network: first octet range, valid network numbers, total number for this class of network, number of hosts per network

Back 29

First octet range = 192 to 223
Valid Network Numbers = 192.0.1.0 - 223.255.254.0
Total number for class of network = 2^21 (2,097,152)
Total number of hosts = 2^8-2

Front 30

Left arrow or Ctrl-b

Back 30

This moves the cursor backward in the currently displayed command without deleting characters

Front 31

Right arrow or Ctrl-f

Back 31

This moves the cursor forward in the currently displayed command without deleting characters

Front 32

This moves the cursor backward in the currently displayed command , deleting characters

Back 32

Backspace

Front 33

This moves the cursor directly to the first character of the currently displayed command

Back 33

Ctrl-a

Front 34

Ctrl-e

Back 34

This moves the cursor directly to the end of the currently displayed command

Front 35

This redisplays the command line with all characters. Its useful when messages clutter the screen

Back 35

Ctrl-r

Front 36

Ctrl-d

Back 36

This deletes a single character

Front 37

This moves back one word

Back 37

Esc-b

Front 38

Esc-f

Back 38

This moves forward one word

Front 39

hostname(config)#

Back 39

Global configuration mode. First mode after configure termina commandl

Front 40

hostname(config-line)#

Back 40

Mode = Line
Command(s) to reach mode =
line console 0
line vty 0 15

Front 41

hostname(config-if)#

Back 41

Mode = interface
Command to reach mode =
interface [type number]

Front 42

Stores the initial configuration used any time the switch reloads IOS. Stored in NVRAM

Back 42

Startup-config

Front 43

Running-config

Back 43

Stores the currently used configuration commands. This file changes dynamically when someone enters commands in configuration mode

Front 44

1st step in SSH config on Cisco IOS-based Switch

Back 44

Change the vty lines to use usernames, with either locally configured usernames or an AAA server. IN this case, the login local subcommand defines the use of local usernames, replacing the login subcommand in vty configuration mode

Front 45

Tell the switch to accept both telnet and ssh with the transport input telnet ssh vty subcommand.

Back 45

2nd step in SSH config on Cisco IOS-based Switch

Front 46

3rd step in SSH config on Cisco IOS-based Switch

Back 46

Add one or more username [name] password [pass-value] with global config commands

Front 47

Configure a DNS domain name with ip domain-name [name] global config command

Back 47

4th step in SSH config on Cisco IOS-based Switch

Front 48

5th step in SSH config on Cisco IOS-based Switch

Back 48

Configure the switch to generate a matched public and private key pair, as well as shared encryption key, using the crypto key generate rsa global config command

Front 49

6th step in SSH config on Cisco IOS-based Switch

Back 49

Although no switch commands are required, each SSH client needs a copy of the switch's public key before the client can connect