Deploying Ethernet Switching

Question 1

Layer 1 device that regenerates and retransmits signals to overcome media distance limitations

Answer 1

Repeater

Question 2

Layer 1 network device that translates signals received over one media type for transmission over a different media type

Answer 2

Media converter

Question 3

Layer 1 network device used to implement a star network topology on legacy Ethernet networks working as a multiport repeater

Answer 3

Hub

Question 4

System that distinguishes transmit and receive pins on different interface systems. The interface on an end system is MDI while that on an intermediate system is MDI-X

Answer 4

Medium dependent interface (MDI)

Question 5

Intermediate system that isolates collision domains to separate segments while joining segments within the same broadcast domain.

Answer 5

Bridge

Question 6

Network segment in which all nodes receive the same broadcast frames at later 2

Answer 6

Broadcast domain

Question 7

Intermediate system used to establish contention free network segments at layer 2

Answer 7

Switch

Question 8

Function of an Ethernet switch whereby collision domains are reduced to the scope of a single port only.

Answer 8

Microsegmentation

Question 9

Hardware address that uniquely identifies each network interface at layer 2. A MAC address is 48 bits long with the first half representing the manufacturers Organizationally Unique Identifier (OUI)

Answer 9

Media access control address (MAC)

Question 10

IEEE’s preferred term for a network interface’s unique identifier. An EUI-48 corresponds to a MAC address while and EUI-64 is one that uses a 64-bit address space.

Answer 10

Extended unique Identifier (EUI)

Question 11

Common term for the protocol data unit for layer 2

Answer 11

Frame

Question 12

Fields in a frame used to identify source and destination MAC addresses, protocol type and error detection

Answer 12

Ethernet headers

Question 13

Calculation of a checksum based on the contents of a frame used to detect errors

Answer 13

Cyclic Redundancy Check (CRC)

Question 14

Maximum size in bytes of a frame’s payload. If the payload cannot be encapsulated within a single frame at the data link layer, it must be fragmented.

Answer 14

Maximum Transmission Unit (MTU)

Question 15

Recording data from frames as they pass over network media, using methods such as a mirror port or tap device

Answer 15

Packet sniffer

Question 16

Command line packet sniffing utility

Answer 16

Tcpdump

Question 17

Widely used protocol analyzer

Answer 17

Wire shark

Question 18

Set of commands in a switch OD to report configuration or interface information

Answer 18

Show commands

Question 19

Port setting that determines the speed of the link. The same setting must be used on the connected device and is usually autonegotiated.

Answer 19

Speed

Question 20

Network link that allows interfaces to send and receive simultaneously

Answer 20

Duplex

Question 21

Interface that can detect a connection type and configure as MDI or MDI-X as appropriate

Answer 21

Auto MDI/MDIX

Question 22

Data store on a switch that keeps track of the MAC addresses associated with each port. As the switch uses a type of memory called Content Addressable Memory (CAM) this is sometimes called the CAM table.

Answer 22

MAC address table

Question 23

Preventing a device attached to a switch port from communicating on the network unless it matches a given MAC address or other protection profile

Answer 23

Port security

Question 24

Combining the bandwidth of two or more switch ports into a single channel link

Answer 24

Port aggregation

Question 25

IEEE protocol governing the use of bonded Ethernet ports (NIC teaming)

Answer 25

Link aggregation control protocol (LACP)

Question 26

Copying ingress and or egress communications from one or more switch ports to another port. This is used to monitor communications passing over the switch.

Answer 26

Port mirroring

Question 27

Ethernet frame with a payload larger than 1500 bytes (up to about 9000 bytes)

Answer 27

Jumbo frame

Question 28

Mechanism defined in IEEE 802.3a that allows a server to instruct a switch to pause traffic temporarily to avoid overwhelming its buffer and causing it to drop frames

Answer 28

Flow control

Question 29

Specification allowing power to be supplied via switch ports and ordinary data cabling to devices such as VoIP handsets and wireless access points. Devices can draw up to about 13W (or 25W for PoE+)

Answer 29

Power over Ethernet (PoE)