Checkpoint Exam: Ethernet Concepts

In addition to the cable length, what two factors could interfere with the communication carried ove rUTP cables?

crosstalk

electromagnetic interference

What is a primary role of the Physical layer in transmitting data on the network?

create the signals that represent the bits in each frame on the media

Horizontal cabling structure

copper cables

Desktop PCs in an enterprise office

copper cables

Backbone cabling in an enterprise

fiber optic

Long-haul networks

fiber optic

Guest access in a coffee shop

wireless

Waiting rooms in a hospital

wireless

What are two characteristics of fiber-optic cable?

it is not affected by EMI or RFI

it is more expensive than UTP cabling is

A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput?

the amount of traffic that is currently crossing the network

the type of traffic that is crossing the network

the latency that is created by the number of network devices that the data is crossing

What is contained in the trailer of a data-link frame?

error detection

Which two statements describe the services provided by the data link layer?

It manages the access of frames to the network media.

It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.

What is a characteristic of the LLC sublayer?

It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media. 

During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?

The physical address is added.

Which three basic parts are common to all frame types supported by the data link layer? (Choose three)

header

data

trailer

Which media communication type does not require media arbitration in the data link layer?

full-duplex

Which statement is true about the CSMA/CD access method that is used in Ethernet?

All network devices must listen before transmitting

A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?

partial mesh

What type of communication rule would best describe CSMA/CD?

access method

What are two examples of the cut-through switching method? (Choose two)

fast=forward switching

fragment-free switching

A network administrator is connecting two modem switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection?

The link between the switches will work at the fastest speed that is supported by both switches.

The link between switches will work as full-duplex.

The auto-MDIX feature will configure the interface eliminating the need for a crossover cable.

What is the purpose of the FCS field in a frame?

to determine if errors occurred in the transmission and reception

What is a multicast MAC address?

01-00-5E-00-00-03

What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?

has a lower latency appropriate for high-performance computing applications

A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100BASE-T network. Which method of memory buffering would work best for this task?

shared memory buffering

What is the auto-MDIX feature?

It enables a device to automatically configure an interface to use a straight-forward or a crossover cable.

Which advantage does the store-and-forward switching method have compared with the cut-through switching method?

frame error checking

When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?

CRC in the trailer

What are two actions performed by a Cisco switch? (Choose two)

Using the source MAC addresses of frames to build and maintain a MAC address table.

Utilizing the MAC address table to forward frames via the destination MAC address

What does the term “attenuation” mean in data communication?

loss of signal strength as distance increases

What makes fiber preferable to copper cabling for interconnecting buildings?

Greater distances per cable run. 

Limited susceptibility to EMI/RFI

What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?

latency

Which two functions are performed at the MAC sublayer of the OSi data link layer?

Provides a mechanism to allow multiple devices to communicate over a shared medium.

Controls the NIC responsible for sending and receiving data on the physical medium.

What action will occur if a host receives a frame with a destination MAC address of FF:FF:FF:FF:FF:FF:FF:FF?

The host will process the frame.