Deck 7: Layer 2 Networking Protocols

Question 1

Ethernet has reinvented itself as a strong contender in the fight for market dominance in the layer 2 access space.

Answer 1

True

Question 2

The frame structure of the Ethernet protocol has changed dramatically to accommodate the higher speed GigE services.

Answer 2

False

Question 3

802.3 refers to the ________ protocol and Ethernet refers to ________ protocol.

Answer 3

IEEE, Ethernet II

Question 4

The Ethernet prorocol was first developed by three entities

A) Cisco, Lucent, Xerox
B) Xerox, Intel, Digital
C) Xerox, Cisco, Intel
D) Intel, Lucent, Cisco
E) None of the above

Question 5

The Ether frame structure has the ability to prioritize packets by stamping them as high priority.

Question 6

The Ethernet frame is fixed not variable in length.

Question 7

Etherent was first used as a WAN application.

Question 8

The Ethernet protocol used in LAN networks is significantly different from the Ethernet protocol used in WAN networks.

Question 9

The primary value Ethernet provides as a WAN technology is familiarity and comfort level of IT managers.

Question 10

Ethernet today is deployed under three interface speeds:

A) DS1, 10Base T, 10Base F
B) 10BaseT, 100BaseT, FDDI
C) 10BaseT, FastE, GigE
D) All of the above
E) None of the above

Question 11

The media access layer (MAC) and the logical link layer (LLC) are both sublayers of the ________ link layer and are designed to handle addressing for the individual physical devices connected to the LAN.

Question 12

The MAC address is a(n) ________ addressing scheme because it is not dependent upon an address hierarchy, as is an IP address.

Question 13

The advantage of frame relay is its:

A) speed
B) vast variety of applications
C) low maintenance
D) simplicity

Question 14

The ________ is one of the most talked-about layer 2 protocols in the network today and is developed around a 53-octet cell structure.

Question 15

Traffic flowing from the ATM switch to the access device is traveling into the ingress of the network.

Question 16

Unlike the router, the frame switch does not have to crack the IP packet to know where to switch or route the traffic.

Question 17

A(n) ________ oriented protocol relies on predefined virtual paths configured at the time the circuit is turned up and depends on the paths to remain in place until the circuit is disconnected.

Question 18

________ protocol defines the source and destination address of the originating and terminating devices in the overhead of the frame and then relies on each intermediate device to route the packet to the correct destination.

Question 19

Which is not a connection oriented technology

A) ATM
B) frame relay
C) IP
D) none of the above (all are connection oriented)

Question 20

Permanent virtual circuits (PVCs) and switched virtual circuits (SVCs) are two types of logical circuits used in connectionless oriented protocols.

Question 21

The X.25 protocol is unsuitable for today's communications because of its.

A) low data transmission speed
B) high latency rate
C) extensive error checking and retransmission schemes necessary
D) high error rate
E) all of the above

Question 22

The ________ relay protocol was meant to solve many of the problems associated with the X.25 protocol and was built to take advantage of the new digital high-speed circuits allowing for higher-speed interfaces

Question 23

Frame relay:

A) is a connectionless oriented protocol
B) does not require the information to be opened by every device in order to know which circuit to route it on
C) takes the information longer to travel the network
D) does not require that a VC be built between devices before the circuit is turned up for service
E) requires high-cost equipment
F) is a relatively complicated and sophisticated protocol

Question 24

The portion of the frame relay network that interfaces with the customer premises equipment and is also called the enterprise network is the:

A) virtual path identifier
B) backbone network
C) switching equipment
D) access piece

Question 25

All of the following are parameters used to define a frame relay circuit except the:

A) SLA
B) DLCI
C) CIR
D) speed of the port

Question 26

Discard eligible means that the information is not critical and can be thrown out if the circuit experiences ________.

Question 27

A frame relay switch has three components, the access interfaces, the network interfaces, and the switching fabric.

Question 28

Most frame relay switches are categorized by switching ________.

Question 29

Although it is possible for voice to travel across a frame relay network, consistent use of frame relay for this purpose is difficult and unreliable.

Question 30

The ATM cell is a(n) ________-octet cell.

Question 31

The advantage of using the ATM protocol is:

A) extensive quality-of-service features
B) its ubiquitous nature
C) both of the above
D) neither of the above

Question 32

Unlike frame relay, ATM does not rely on the intelligence of upper layers to ensure that information arrives uncorrupted.

Question 33

The ATM physical layer defines the:

A) interface type
B) interconnection rate
C) electrical characteristics of the signal
D) type of handoff made between devices
E) all of the above

Question 34

________ multiplexing ATM bonds T1 circuits together to produce one large circuit that can handle a greater volume of bits at one time than multiple small circuits can.

Question 35

The function of the ATM layer is to:

A) handle the PVC and SVC logical circuit connections
B)perform error checking on the header information to ensure that the layer 2 overhead has not been corrupted
C) be responsible for moving information between the adaptation layer and the physical layer
D) all of the above

Question 36

Which layer is responsible for placing information in the appropriate packages and giving it different priorities in the network for ATM to carry the information reliably across the network?

A) physical
B) ATM
C) adaptation
D) synchronous

Question 37

An acronym for the term meaning a measure of the telephone service quality provided to a subscriber is:

A) ABR
B) UBR
C) Nrt-VBR
D) QoS
E) AAL
F) CBR

Question 38

The purpose of the ATM protocol is to provide a way to converge all types of traffic onto one network.

Question 39

The cost of ATM switches is higher than ever due to the increasing popularity of the ATM protocol.

Question 40

Converting other signal types such as TDM, frame relay, and IP into an ATM cell and aggregating all of the cells together into one signal is the main purpose of the ATM:

A) switch
B) concentrator
C) end device
D) none of the above