CCNA 1 v7 Modules 4-7: Ethernet Concepts Exam Answers (all)

shared memory buffering

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?

- 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 interfaces eliminating the need for a crossover cable.

A network administrator is connecting two modern 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? (Choose three.)

- 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

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? (Choose three.)

Partial mesh

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?

The Physical Address is added

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

- Crosstalk - Electromagnetic Interference

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)

CC

Refer to the exhibit. What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1?

the untwisted length of each wire is too long

Refer to the exhibit. What is wrong with the displayed termination?

latency

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

bandwidth

What OSI physical layer term describes the capacity at which a medium can carry data?

throughput

What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?

goodput

What OSI physical layer term describes the measure of usable data transferred over a given period of time?

air

What OSI physical layer term describes the physical medium for microwave transmissions?

fiber-optic cable

What OSI physical layer term describes the physical medium that uses the propagation of light?

copper cable

What OSI physical layer term describes the physical medium which uses electrical pulses?

modulation

What OSI physical layer term describes the process by which one wave modifies another wave?

The host will discard the frame

What action will occur if a host receives a frame with a destination MAC address it does not recognize?

the host will discard the frame

What action will occur if a host receives a frame with a destination MAC address it does not recognize?

The host will process the frame

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

the host will process the frame

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

The switch refreshes the timer on that entry

What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?

The switch forwards it out all ports except the ingress port

What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?

The switch forwards it out all ports except the ingress port

What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?

- Ethernet utilizes CSMA/CD - Media access control provides placement of data frames onto the media - Data link layer protocols define the rules for access to different media

What are three ways that media access control is used in networking? (Choose three.)

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

- Not affected by EMI or RFI - It is more expensive than UTP cabling is

What are two characteristics of fiber-optic cable? (Choose two.)

- Fast forward switching - fragment free switching

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

loss of signal strength as distance increases

What does the term "attenuation" mean in data communication?

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

What is a characteristic of the LLC sublayer?

Create the signals that represent the bits in each frame on to the media

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

Error detection

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

has a lower latency appropriate for high-performance computing applications

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

The automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection

What is the auto-MDIX feature on a switch?

It enables a device to automatically configure an interface to use a striaght-through or a crossover cable

What is the auto-MDIX feature?

To verify the integrity of the received frame

What is the function of the CRC value that is found in the FCS field of a frame?

to determine if errors occurred in the transmission and reception

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

transmitting bits across the local media

What is the purpose of the OSI physical layer?

- greater distances per cable run - limited susceptibility to EMI/RFI - greater bandwidth potential

What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)

- Source MAC address - destination MAC address - error-checking information

What three items are contained in an Ethernet header and trailer? (Choose three.)

access method

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

CRC in the trailer

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

frame error checking

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

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

Which characteristic describes crosstalk?

store and forward switching

Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?

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

Which is a multicast MAC address?

Full-duplex

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

Twisting opposing circuit wire pairs together

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

They vary depending on protocols

Which statement describes a characteristic of the frame header fields of the data link layer?

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

Which statement describes an extended star topology?

All network devices must listen before transmitting

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

fast-forward

Which switching method has the lowest level of latency?

store-and-forward

Which switching method uses the CRC value in a frame?

- Header - Data - Trailer

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

- Cordless phones - Microwaves

Which two devices commonly affect wireless networks? (Choose two.)

- Frame Check Sequence - minimum frame size

Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer or discarded by the NIC? (Choose two.)

- Adds layer 2 control information to network protocol data - Enables IPv4 and IPv6 to utilize the same network interface and media

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

- Adds layer 2 control information to network protocol data - Places information in the frame that identifies which network layer protocol is being used for the frame

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

- Enables IPv4 and IPv6 to utilize the same network interface and media - Places information in the frame that identifies which network layer protocol is being used for the frame

Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)

- Integrates various physical technologies - Implements a trailer to detect transmission errors

Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)

- Logical link control is implemented in software - The data link layer uses LLC to communicate with the upper layers of the protocol suite

Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)

- 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

Which two statements describe the services provided by the data link layer? (Choose two.)

Straight-through

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

They allow for full-duplex connectivity

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

The magnetic field around the adjacent pairs of wire

With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?