cisco chapter 4
Which statement describes an extended star topology
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
What are two services performed by the data link layer of the OSI model? (Choose two.)
It accepts Layer 3 packets and encapsulates them into frames.* It provides media access control and performs error detection
What is one advantage of using fiber optic cabling rather than copper cabling
It is able to carry signals much farther than copper cabling
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.
Multimode Fiber
LED as light source several paths of light into the fiber generally used with LANs
What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame
LLC
What is true concerning physical and logical topologies
Logical topologies determine the media access control method used.
What is true concerning physical and logical topologies
Logical topologies refer to how a network transfers data between devices.
Which statement describes the media access control methods that are used by the networks in the exhibit?
Network 1 uses CSMA/CD and Network 3 uses CSMA/CA
Sort elements
The physical layer encodes the frames -> Step 1 The physical layer creates the signals that represent the bits in each frame -> Step 2 The signals are sent on the media one at a time. -> Step 3 The physical layer retrieves the individual signals from the media -> Step 4 The physical layer restores the individual signals to their bit representations -> Step 5
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.
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
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
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
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
data link
What is contained in the trailer of a data-link frame
error detection
Which method of data transfer allows information to be sent and received at the same time
full duplex
Single-mode Fiber
only one ray of light into the fiber generally used for campus backbone laser as light source
Which characteristic describes crosstalk?
the distortion of the transmitted messages from signals carried in adjacent wires
What is indicated by the term throughput?
the measure of the bits transferred across the media over a given period of time
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 function of the CRC value that is found in the FCS field of a frame?
to verify the integrity of the received frame
What technique is used with UTP cable to help protect against signal interference from crosstalk
twisting the wires together into pairs
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
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
Which type of connector does a network interface card use
RJ-45
