Mod 6/7 Check Your Understanding

Which part of an Ethernet frame detects errors in the frame?

Frame Check Sequence

Which data link sublayer controls the network interface through software drivers?

LLC

Which data link sublayer works with the upper layers to add application info for delivery of data to higher level protocols?

LLC

What is another name for the OSI data link layer?

Layer 2

The media access control methods depends on what two criteria?

Media sharing and topology

Which part of an Ethernet Frame uses a pad to increase the frame field to at least 64 bytes?

Data Field

What organization defines standards for the network access layer?

IEEE

The IEEE 802 LAN/MAN data link layer consists of what 2 sublayers?

Logical Link Control (LLC) and Media Access Control (MAC)

What is the responsibility of the MAC sublayer?

Provides the method for the frame to get off and on the media

What is the function of the last field in a data link layer frame?

To determine whether the frame experienced transmission errors

What kind of network would use point-to-point, hub and spoke, or mesh topologies?

WAN

Which lists the Layer 2 and Layer 3 address fields in the correct order? a. destination NIC add., source NIC add., source IP add., destination IP add. b. source NIC add., destination NIC add., source IP add., destination IP add. c. destination NIC add., source NIC add., destination IP add., source IP add. d. source NIC add., destination NIC add., destination IP add., source IP add.

a

Which part of an Ethernet Frame describes the higher-layer protocol that is encapsulated? a. EtherType b. Preamble c. Start of Frame Delimiter d. Frame Check Sequence

a

What Layer 2 function does a router perform? (Choose three.) a. accepts a frame from a medium b. de-encapsulates the frame c. refers it to Layer 3 routing table for a matching destination network d. re-encapsulates the frame

a, b, d

What is the function of the MAC sublayer? a. controls access to the media b. checks for errors received in bits c. uses CSMA/CD or CSMA/CA to support ethernet tech d. communicates between software at the upper layers and the device hardware at the lower layers e. allows multiple Layer 3 protocols to use the same network interface and media

a,b,c

Which of the following are data link layer protocols? a. 802.11 b. Ethernet c. IP d. PPP e. UDP

a,b,d

What feature automatically negotiates the best speed and duplex setting between interconnecting devices?

autonegotiation

Which part of an Ethernet Frame notifies the receiver to get ready for a new frame? a. EtherType b. Preamble c. Start of Frame Delimiter d. Frame Check Sequence

b

What are two methods for switching data between ports on a switch? a. cut-off switching b. cut-through switching c. store-and-forward switching d. store-and-supply switching e. store-and-restore switching

b,c

Which two types of memory buffering techniques are used by switches? a. long-term memory buffering b. port-based memory buffering c. shared memory buffering d. short-term memory buffering

b,c

What does the data link layer add to a Layer 3 packet to create a frame? a. flags b. sequence number c. header d. trailer

c, d

Which media access control method is used in legacy Ethernet LANs?

carrier sense multiple access/collision detection

Which switching method can be implemented using fast-forward switching or fragment-free switching?

cut-through switching

Which duplex communication method is used in WLANs?

half-duplex

Which topology displays networking device layer IP addresses?

logical topology

Which LAN topology is a hybrid topology?

extended star