Definitions

Question 1

adjacent layer interaction

Answer 1

when a process communicates w/ a process that is a layer above or below it. Normally requesting service or delivering info.

Question 2

deencapsulation

Answer 2

stripping a header for a specific layer off the “data” and using it.

Question 3

encapsulation

Answer 3

adding a header to a piece of data from a layer above it.

Question 4

frame

Answer 4

a layer 2 data unit

Question 5

networking model

Answer 5

a model that breaks up the process of data transport

Question 6

packet

Answer 6

a layer 3 data unit

Question 7

PDU

Answer 7

the OSI generic term for a chunk of data. Normally annotated LxPDU

Question 8

same layer interaction

Answer 8

the interaction of processes on machines communicating with eachother

Question 9

segment

Answer 9

a layer 4 data unit

Question 10

leased line

Answer 10

a point to point data connection that appears as a single physical cable

Question 11

wide area network

Answer 11

a network or part of a network that crosses a large physical area. Often connects two LANs. often out of users control.

Question 12

telco

Answer 12

telecommunications company

Question 13

serial interface

Answer 13

an interface that sends data serially

Question 14

HDLC

Answer 14

High-level data link control. A WAN protocol.

Question 15

DSL

Answer 15

Digital Subscriber Line. A WAN technology that uses phone lines as layer 1 links.

Question 16

Cable internet

Answer 16

A WAN link that uses cable lines to transport data.

Question 17

DSL modem

Answer 17

a device that separates data from voice signals and enables broadband communication on a phone line.

Question 18

Ethernet over MPLS (EoMPLS)

Answer 18

Appears logically identical to an ethernet link

Question 19

command-line interface (CLI)

Answer 19

a shell that responds to commands for human computer interaction

Question 20

Telnet

Answer 20

unsecure IPv4 machine to machine communication.

Question 21

Secure Shell (SSH)

Answer 21

secure (encrypted) IPv4 machine to machine communication

Question 22

enable mode

Answer 22

allows a user to run more privelidged commands

Question 23

user mode

Answer 23

allows a user to run basic commands that don’t affect the function of an IOS device

Question 24

configuration mode

Answer 24

allows a user to manipulate the configuration of an IOS device

Question 25

startup config file

Answer 25

the file that's stored on the NVRAM which is used as the running configuration upon startup.

Question 26

running config file

Answer 26

the config file that's stored in RAM and is actively used during a devices operation. This is lost if the machine is shut down without saving it.

Question 27

local username

Answer 27

a locally stored username and password referenced for security purposes and login services

Question 28

VLAN interface

Answer 28

the interface that is used for Switch administration.

Question 29

port security

Answer 29

using security settings on ports. Includes limiting number of different users based on MAC addresses.

Question 30

802.1Q

Answer 30

Trunk protocol that uses a 4 byte header to identify which VLAN a frame belongs to

Question 31

trunk

Answer 31

a connection between devices that carries traffic from different VLANs.

Question 32

trunking administrative mode

Answer 32

sets an interfaces purpose as one end of a trunk

Question 33

trunking operational mode

Answer 33

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Question 34

VLAN

Answer 34

virtual LAN. A logical broadcast domain.

Question 35

VTP

Answer 35

VLAN Trunking Protocol. A proprietary Cisco feature that spreads VLAN information in a network so that Cisco devices can discover different VLANs.

Question 36

VTP transparent mode

Answer 36

effectively turns VTP off for the device

Question 37

Layer 3 switch

Answer 37

a switch that basically has a router built into it.

Question 38

access interface

Answer 38

an interface that is used by an end machine to connect to the network

Question 39

trunk interface

Answer 39

an interface that is used by a network device to move traffic between devices that keeps VLANs separate.