Cisco CCNA 1 Chapter 4 2015

The throughput of a FastEthernet network is 80 Mb/s. The traffic overhead for establishing sessions, acknowledgments, and encapsulation is 15 Mb/s for the same time period. What is the goodput for this network?

65 Mb/s

A network administrator is required to upgrade wireless access to end users in a building. To provide data rates up to 1.3 Gb/s and still be backward compatible with older devices, which wireless standard should be implemented?

802.11ac

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

International Organization for Standardization (ISO) International Telecommunication Union (ITU) The IANA is responsible for overseeing and managing IP address allocation, domain name management, and protocol identifiers. The EIA is an international standards and trade alliance for electronics organizations, and is best known for its standards related to electrical wiring, connectors, and the 19-inch racks used to mount networking equipment. The ISOC promotes the open development, evolution, and use of the Internet throughout the world.

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

It is able to carry signals much farther than copper cabling.

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

They vary depending on protocols.

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

data link

Fill in the blank. In fiber optic media, the signals are represented as patterns of ________.

LIGHT Light light

Fill in the blank. What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame? _____

LLC

Which two statements are true of the deterministic access method? (Choose two.)

The throughput is predictable. Devices take turns transmitting.

A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)

security interference coverage area

A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)

EMI RFI

What is one main characteristic of the data link layer?

It shields the upper layer protocol from being aware of the physical medium to be used in the communication.

What is true concerning physical and logical topologies?

Logical topologies determine the media access control method used.

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

to identify which network layer protocol is being used

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices??

1 - rollover, 2 - straight-through, 3 - crossover

Fill in the blank with a number. 10,000,000,000 b/s can also be written as _____ Gb/s.

10

Which statement is correct about multimode fiber?

SC-SC patch cords are used with multimode fiber cables.

Which statement describes signaling at the physical layer?

Sending the signals asynchronously means that they are transmitted without a clock signal.

What is a characteristic of a WAN hub-and-spoke topology?

The branch sites are connected to a central site through point-to-point links.​

As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame??

The transmitting node inserts start and stop bits into the frame.

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

The untwisted length of each wire is too long.

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

They allow for full-duplex connectivity.

What are two characteristics of 802.11 wireless networks? (Choose two.)

They use CSMA/CA technology. Collisions can exist in the networks.

Fill in the blank. The term________ indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).?

bandwidth

How is the magnetic field cancellation effect enhanced in UTP cables?

by increasing and varying the number of twists in each wire pair

An administrator measured the transfer of usable data across a 100 Mb/s physical channel over a given period of time and obtained 60 Mb/s. Which kind of measurement did the administrator obtain?

goodput

Which two factors influence the method that is used for media access control? (Choose two.)

how the connection between nodes appears to the data link layer how nodes share the media

Refer to the exhibit. One end of the cable is terminated as displayed, and the other end is terminated in accordance with the T568A standard. What type of cable would be created in this manner?

straight-through A crossover cable has a T568A standard termination at one end and a T568B standard at the other end. A rollover cable can have either a T568A or T568B standard termination at one end, and at the other end have the same standard, but with the wires connected in reverse order. A straight-through cable can have either a T568A or T568B standard termination at one end and the same at the other end. A fiber-optic cable is not terminated using RJ-45 connectors.

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

to determine if errors occurred in the transmission and reception

What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

to distinguish data bits from control bits to identify where the frame starts and ends

What is the purpose of the physical link control field in a data link layer header?

to establish the media link Refer to curriculum topic: 4.4.4 Physical link control, flow control, and congestion control are possible fields that may be found in certain frames. The physical link control field is used to establish the media link. The logical connection control field is used to establish a logical connection between nodes. The flow control field is used to start and stop traffic over the media, and the congestion control field is used to indicate congestion in the media.

When is a wired connection preferred to a wireless connection by an end-user device?

when the end-user device will run an application that requires a dedicated connection to the network