St.JOSEPH'S - CISCO IDEATHON PREPARATION TEST CCNA M1 @ 16/6/24

What is the purpose of the OSI physical layer?

• • controlling access to media

• • transmitting bits across the local media

• • performing error detection on received frames

  
  

• • exchanging frames between nodes over physical network media

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

• • They allow for full-duplex connectivity.

• • The two strands allow the data to travel for longer distances without degrading.

• • They prevent crosstalk from causing interference on the connection.

• • They increase the speed at which the data can travel.

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.)

• • 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

• • the sophistication of the encapsulation method applied to the data

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

• • It is not affected by EMI or RFI.

• • It is more expensive than UTP cabling is.

• • Each pair of cables is wrapped in metallic foil.

• • It typically contains 4 pairs of fiber-optic wires.

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

• • the magnetic field around the adjacent pairs of wire

• • the use of braided wire to shield the adjacent wire pairs

• • the reflection of the electrical wave back from the far end of the cable

• • the collision caused by two nodes trying to use the media simultaneously

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

• • crosstalk

• • electromagnetic interference

• • bandwidth

• • size of the network

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

• • cordless phones

• • microwaves

• • Blu-ray players

• • external hard drives

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

• • It defines the end-to-end delivery addressing scheme.

• • It maintains the path between the source and destination devices during the data transmission.

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

• • to verify the integrity of the received frame

• • to verify the physical address in the frame

• • to compute the checksum header for the data field in the frame

• • to verify the logical address in the frame

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?

• • hub and spoke

• • mesh

• • partial mesh

• • point-to-point