CIS Module 4-7

(6.3) Which of the following are data link layer protocols? (Choose three)

- 802.11 - ethernet - PPP

What are the two sublayers of the OSI model data link layer? (Choose two.)

- LLC - MAC

(6.1) The IEEE 802 LAN/MAN data link layer consists of which two sublayers? (Choose two.)

- Logical Link Control - Media Access Control

(6.1) What Layer 2 function does a router perform? (Choose three.)

- accepts a frame from a medium - de-encapsulates the frame - re encapsulates the packet into a new frame

(7.1) What is a function of the MAC sublayer? (Choose three)

- controls access to media - checks for errors in received bits - uses CSMA/CD or CSMA/CA to support Ethernet technology

(6.3) What does the data link layer add to a Layer 3 packet to create a frame? (Choose two.)

- header - trailer

What are two services performed by the data link layer of the OSI model? (Choose two.)

- it provides media access control + performs error detections - it accepts layer 3 packets and encapsulates them into frames

(6.1) The media access control method used depends on which two criteria?

- media sharing - topology

What method is used to manage contention-based access on a wireless network?

CSMA/CA

Which data link layer media access control method does Ethernet use with legacy Ethernet hubs?

CSMA/CD

(4.1) The physical layer of the receiving device passes bits up to which higher level layer?

Data Link

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

Data field

(7.1) Which part of an Ethernet Frame describes the higher-layer protocol that is encapsulated?

EtherType

(4.1) True or false? The physical layer is only concerned with wired network connections.

False

(4.1) True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time.

False

(4.1) What PDU is received by the physical layer for encoding and transmission?

Frame

(7.1) Which part of an Ethernet frame detects errors in the frame?

Frame Check sequence

Which two engineering organizations define open standards and protocols that apply to the data link layer? (Choose two.)

IEE, ITU

(6.1) Which organization defines standards for the network access layer (i.e., the OSI physical and data link layers)?

IEEE

Which standards organization oversees development of wireless LAN standards?

IEEE

Which statement correctly describes frame encoding?

It converts bits into a predefined code in order to provide a predictable pattern to help distinguish data bits from control bits

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

LLC

(7.1) Which data link sublayer works with the upper layers to add application information for delivery of data to higher level protocols?

LLC

What is true concerning physical and logical topologies?

Logical topologies refer to how a network transfers data between devices

What attribute of a NIC would place it at the data link layer of the OSI model?

MAC address

What identifier is used at the data link layer to uniquely identify an Ethernet device?

MAC address

(7.1) Which part of an Ethernet Frame notifies the receiver to get ready for a new frame? You got it!

Preamble

(4.3) Which of the following counters EMI and RFI by using shielding techniques and special connectors?

STP

A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended?

The end-user device needs mobility when connecting to the network

(4.3) Which of the following is the most common network media?

UTP

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

WAN

(4.2) Which of these is the name for the capacity of a medium to carry data?

bandwidth

(4.6) Which of the following wireless standards is used for Personal Area Networks (PANs) and allows devices to communicate over distances of 1 to 100 meters?

bluetooth

What is a characteristic of UTP cabling?

calcellation

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

carrier sense multiple access/collision detection

(4.3) Which of the following terminates with BNC, N type and F type connectors?

coaxial

(4.3)Which of the following attaches antennas to wireless devices? It can also be bundled with fiber-optic cabling for two-way data transmission.

coaxial

(4.2) Which media uses electrical pulses to represent bits?

copper

Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

data link

Which statement describes the half-duplex mode of data transmission?

data transmitted over the network flows in one direction at a time

(6.3) Which lists the Layer 2 and Layer 3 address fields in the correct order?

destination NIC address, source NIC address, source IP address, destination IP address

(6.2) Which LAN topology is a hybrid topology?

extended star

(6.2) Which duplex communication method is used in WLANs?

half-duplex

What is one advantage of using fiber optic cabling rather than copper cabling?

it is able to carry signals much farther than copper cabling

(6.1) What is another name for the OSI data link layer?

layer 2

(6.2) Which topology displays networking device layer IP addresses?

logical topology

A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Which physical topology requires that every node is attached to every other node on the network?

mesh

(4.5) Which of the following fiber-optic cable types can help data travel approximately 500 meters?

multimode

(4.5) Which of the following fiber-optic cable types is used within a campus network?

multimode

(4.5) Which of the following fiber-optic cable types use light emitting diodes (LEDs) as a data light source transmitter?

multimode

A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

physical layer

(6.1) What is the responsibility of the MAC sublayer?

provide the method to get the frame on/off the media

What type of cable is used to connect a workstation serial port to a Cisco router console port?

rollover

(4.5) Which of the following fiber-optic cable types can travel approximately 100 km?

single mode

(4.5) Which of the following fiber-optic cable types is used to connect long-distance telephony and cable TV applications?

single-mode

(4.5) Which of the following fiber-optic cable types use lasers in a single stream as a data light source transmitter?

single-mode

What type of physical topology can be created by connecting all Ethernet cables to a central device?

star

Which type of UTP cable is used to connect a PC to a switch port?

straight-through

What is the definition of bandwidth?

the amount of data that can flow from one place to another in a given amount of time

Which characteristic describes crosstalk?

the distortion of the transmitted messages from signals carried in adjacent wires

Which characteristic describes crosstalk?

the measure of the bits transferred across the media over a given period of time

A wireless LAN is being deployed inside the new one room office that is occupied by the park ranger. The office is located at the highest part of the national park. After network testing is complete, the technicians report that the wireless LAN signal is occasionally affected by some type of interference. What is a possible cause of the signal distortion?

the microwave oven

Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?

the use of full-duplex capable layer 2 switches

(4.2) Which of these is a measure of the transfer of bits across the media?

throughput

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

to determine whether the frame experienced transmission errors

Which is a function of the Logical Link Control (LLC) sublayer?

to identify which network layer protocol is being used

What is the purpose of the OSI physical layer?

transmitting bits across the local media

Which procedure is used to reduce the effect of crosstalk in copper cables?

twisting opposing circuit wire pairs together

(4.2) Which media uses patterns of microwaves to represent bits?

wireless

(4.6) Which of the following wireless standards is best suited for industrial and IoT environments?

zigbee

Why are two strands of fiber used for a single fiber optic connection?

they allow for full-duplex connectivity

(4.6) True or false. Wireless is not well suited for enterprise networks.

false

(4.7) True or false. Wireless LANs operate in full-duplex allowing all devices to send or receive data at the same time so the number of users does not impact performance.

false

(4.2) Which media uses patterns of light to represent bits?

fiber-optic