Glossary

Question 1

10/100

Answer 1

A short reference to an Ethernet NIC or switch port that supports speed of Mbps and 100 Mbps

Question 2

10/100/1000

Answer 2

A short reference to an Ethernet NIC or switch port that supports speeds of 10 Mbps, 100 Mbps, and 1000 Mbps (1 Gbps)

Question 3

10BASE-T

Answer 3

The 10 Mbps baseband Ethernet specification using two pairs of twisted-pair cabling (Categories 3, 4, or 5): one pair transmits data and the other receives data. 10BASE-T, which is part of the IEEE 802.3 specification, has a distance limit of approximately 100 m (328 feet) per segment.

Question 4

100BASE-T

Answer 4

A name for the IEEE Fast Ethernet standard that uses two-pair copper cabling, a speed of 100 Mbps, and a maximum cable length of 100 meters.

Question 5

1000BASE-T

Answer 5

A name for the IEEE Gigabit Ethernet standard that uses four-pair copper cabline, a speed of 1000 Mbps (1 Gbps) and a maximum cable length of 100 meters.

Question 6

2-way state

Answer 6

In OSPF, a neighboar state that implies that the router has exchanged Helos with the neighbor and that all required parameters match.

Question 7

802.11a

Answer 7

The IEEE standard for wireless LANs using the ISM spectrum, DSSS encoding, and speeds of up to 11 Mbps.

Question 8

802.11b

Answer 8

The IEEE standard for wireless LANs using the ISM spectrum, OFDM or DSSS encoding, and multiple antennas for single-stream speeds up to 150 Mbps.

Question 9

802.11g

Answer 9

The IEEE standard for wireless LANs using the ISM spectrum, OFDM or DSSS encoding, and speeds of up to 54 Mbps.

Question 10

802.11n

Answer 10

The IEEE standard for wireless LANs using the ISM spectrum, OFDM encoding, and multiple antennas for single-stream speeds up to 150 Mbps.

Question 11

802.1Q

Answer 11

The IEEE standardizd protocol for VLAN trunking, which also includes RSTP details.

Question 12

802.1x

Answer 12

An IEEE standard that defines port-based access control for wired and wireless networks.

Question 13

AAA

Answer 13

Authentication, authorization, and accounting. Authentication confirms the identity of the user or device. Authorization determines what the user or device is allowed to do. Accounting records information about access attempts, including inappropriate requests.

Question 14

AAA server

Answer 14

A server that holds security information and provides services related to user login, particularly authentication (is the user who he says he is?), authorization (once authenticated, what do we allow the user to do?), and accounting (tracking the user).

Question 15

access interface

Answer 15

A LAN network design term that refers to a switch interface connected to end-user devices, configured so that it does not us VLAN trunking.

Question 16

access layer

Answer 16

In a campus LAN design, the switches that connect directly to end-point devices (servers, user devices), and also connect into the distribution layer switches.

Question 17

access link

Answer 17

In Frame Relay, the physical serial link that connects a Frame Relay DTE device, usually a router, to a Frame Relay switch. The access link uses the same physical layer standards as do point-to-point leased lines.

Question 18

access point (AP)

Answer 18

A device that provides wireless service for clients within its coverage area or cell, with the AP connecting to both the wireless LAN and the wired Ethernet LAN.

Question 19

accounting

Answer 19

In security, the recording of access attempts.

Question 20

address block

Answer 20

A set of consecutive IPv4 addresses. The term is most often used for a classless prefix as defined by CIDR but can also refer to any subnet or IPv4 network.

Question 21

adjacent-layer interaction

Answer 21

The general topic of how, one one computer, two adjacent layers in a networking architectural model work together, with the lower layer providing services to the higher layer.

Question 22

administrative distance

Answer 22

In Cisco routers, a means for one router to choose between multiple routes to reach the same subnet when those routes were learned by different routing protocols. The lower the administrative distance, the better the source of the routing information.

Question 23

ADSL

Answer 23

Asymmetric digital subscriber line. One of many DSL technologies, ADSL is designed to deliver more bandwidth down-stream (from the central office to the customer site) than upstream.

Question 24

all-nodes multicast address

Answer 24

A specific IPv6 multicast address, FF02::2, with link-local scope, used to send packets to all devices that act as IPv6 routers on the local link.

Question 25

alternate port

Answer 25

With RSTP, a port role in which the port acts as an alternative to a switch's root port, so that when the switch's root port fails, the alternate port can immediately take over as the root port.

Question 26

anycast address

Answer 26

An address shared by two or more hosts that exists in different parts of the network, so that by design, the routers will forward packets to the nearest of the two servers, allowing clients to communicate with the nearest such server, not caring which particular server with which the client communicates

Question 27

Area Border Router (ABR)

Answer 27

A router using OSPF in which the router has interfaces in multiple OSPF areas

Question 28

ARP

Answer 28

Address Resolution Protocol. An internet protocol used to map an IP address to a MAC address. Defined in RFC 826

Question 29

ARP table

Answer 29

A list of IP addresses of neighbors on the same VLAN , along with their MAC addresses, as kept in memory by hosts and routers

Question 30

ARPANET

Answer 30

The first packet-switched network, created around 1970, which served as the predecessor to the internet.

Question 31

ASBR

Answer 31

Autonomous System Border Router. A router using OSPF in which the router learns routes via another source, usually another routing protocol, exchanging routes that are external to OSPF with the OSPF domain.

Question 32

asymmetric

Answer 32

A feature of many Internet access technologies, including DSL, cable, and modems, in which the downstream transmission rate is higher than the up-stream transmission rate

Question 33

asynchronous

Answer 33

The lack of an imposed time ordering on a bit stream. Practically, both sides agree to the same speed, but there is no check or adjustment of the rates if they are slightly different. However, because only 1 byte per transfer is sent, slight differences in clock speed are not an issue

Question 34

authentication

Answer 34

In security, the verification of the identity of a person or process

Question 35

authentication server (AS)

Answer 35

An 802.1x entity that authenticates users or clients based on their credentials, as matched against a user database. In a wireless network, a RADIUS server is an AS.

Question 36

authenticator

Answer 36

An 802.1x entity that exists as a network device that provides access to the network. In a wireless network, a WLC acts as an authenticator.

Question 37

authorization

Answer 37

In security, the determination of the rights allowed for a particular user or device.

Question 38

autonegotiation

Answer 38

An IEEE standard mechanism (802.3u) with which two nodes can exchange messages for the purpose of choosing to use the same Ethernet standards on both ends of the link, ensuring that the link functions and functions well.

Question 39

autonomous AP

Answer 39

A wireless AP operating in a standalone mode, such that it can provide a fully functional BSS and connect to the DS

Question 40

autonomous system

Answer 40

An internetwork in the administrative control of one organization, company, or governmental agency, inside which that organization typically runs an interior gateway protocol (IGP)

Question 41

auxiliary port

Answer 41

A physical connector on a router that is designed to be used to allow a remote terminal, or PC with a terminal emulator, to access a router using an analog modem