4.14 Flashcards
(26 cards)
What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)
- > to IDENTIFY where the frame starts and ends
- >to DISTINGUISH data bits from control bits
Which statement is correct about multimode fiber?
SC-SC patch cords are used with multimode fiber cables.
Con C
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
DATA LINK
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 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.)
RFI & EMI
What is the purpose of the FCS field in a frame?
To determine if errors occurred in the transmission and reception
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.*
Which statement describes signaling at the physical layer?
SENDING the signals asynchronously means that they are transmitted without a CLOCK signal.
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.)
Coverage area
Interference
Security
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 one advantage of using fiber optic cabling rather than copper cabling?
It is able to carry signals much FARTHER than copper cabling.
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
Why are two strands of fiber used for a single fiber optic connection?
They ALLOW for full-duplex connectivity.
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
What is true concerning physical and logical topologies?
Logical topologies determine the media access control method used.
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
Refer to the exhibit. What is wrong with the displayed termination?
The untwisted length of each wire is TOO LONG
Fill in the blank with a number:
10,000,000,000 b/s can also be written as “__” Gb/s.
10
What are two characteristics of 802.11 wireless networks? (Choose two.)
- Collisions can exist in the networks.
2. They use CSMA/CA technology.
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
AC
How is the magnetic field cancellation effect enhanced in UTP cables?
by increasing and varying the number of twists in each wire pair
Match the steps to the physical layer operations that occur when data is sent from one node and received at another node:
STEP 1
The physical layer encodes the frames
Match the steps to the physical layer operations that occur when data is sent from one node and received at another node:
STEP 2
The physical layer creates the signals that represent the bits in each frame.
Match the steps to the physical layer operations that occur when data is sent from one node and received at another node:
STEP 3
The signals are sent on the media one at a time.
