Mod 4-7 Exam
What type of communication rule would best describe CSMA/CD?
Access method
Which statement is true about the CSMA/CD access method that is used in Ethernet?
All network devices must listen before transmitting.
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
CRC in the trailer
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
Controls the NIC responsible for sending and receiving data on the physical medium. Provides a mechanism to allow multiple devices to communicate over a shared medium.
Match the situation with the appropriate use of network media.
Copper Cables: -horizontal cabling structure -desktop PCs in an enterprise office Fiber Optic: -backbone cabling in an enterprise -long-haul networks Wireless: -guest access in a coffee shop -waiting rooms in a hospital
What are three ways that media access control is used in networking? (Choose three.)
Data link layer protocols define the rules for access to different media. Media access control provides placement of data frames onto the media. Ethernet utilizes CSMA/CD.
Which port does Switch0 use to send frames to the host with the IPv4 address 10.1.1.5?
Fa0/11
Which two statements describe the services provided by the data link layer? (Choose two.)
It packages various Layer 3 PDUs into a frame format that is compatible with the network interface It manages the access of frames to the network media
What is a characteristic of the LLC sublayer?
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?
The switch refreshes the timer on that entry
Refer to the exhibit. What is wrong with the displayed termination?
The untwisted length of each wire is too long.
Which statement describes a characteristic of the frame header fields of the data link layer?
They vary depending on protocols
Refer to the graphic. What type of cabling is shown?
UTP
What OSI physical layer term describes the capacity at which a medium can carry data?
bandwidth
What is a primary role of the Physical layer in transmitting data on the network?
create the signals that represent the bits in each frame on to the media
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)
crosstalk, electromagnetic interference
What is contained in the trailer of a data-link frame?
error detection
What are two examples of the cut-through switching method? (Choose two.)
fast forward and fragment free switching
Which switching method has the lowest level of latency?
fast-forward
Refer to the graphic. What type of cabling is shown?
fiber
Which advantage does the store-and-forward switching method have compared with the cut-through switching method?
frame error checking
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)
limited susceptibility to EMI/RFI, greater distances per cable run, greater bandwidth potential
What does the term "attenuation" mean in data communication?
loss of signal strength as distance increases
Which two devices commonly affect wireless networks? (Choose two.)
microwaves, cordless phones
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?
partial mesh
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?
shared memory buffering
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. Adds Layer 2 control information to network protocol data.
Which statement describes an extended star topology?
End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
Implements a trailer to detect transmission errors. Provides synchronization between source and target nodes
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
During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
The physical address is added
What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?
has a lower latency appropriate for high-performance computing applications
Which switching method uses the CRC value in a frame?
store and forward
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?
store and forward switching
What is the auto-MDIX feature on a switch?
the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
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
What is the purpose of the FCS field in a frame?
to determine if errors occurred in the transmission and reception
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
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?
00-60-2F-3A-07-CC
Which is a multicast MAC address?
01-00-5E-00-00-03
What is the auto-MDIX feature?
It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
What are two characteristics of fiber-optic cable? (Choose two.)
It is more expensive than UTP cabling is. It is not affected by EMI or RFI.
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
Which media communication type does not require media arbitration in the data link layer?
full duplex
Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
header data trailer
What are two actions performed by a Cisco switch? (Choose two.)
utilizing the MAC address table to forward frames via the destination MAC address using the source MAC addresses of frames to build and maintain a MAC address table
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
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.)
Minimum frame size, Frame Check Sequence
What three items are contained in an Ethernet header and trailer? (Choose three.)
Source MAC, destination MAC, error-checking information
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 auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. 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.
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
The data link layer uses LLC to communicate with the upper layers of the protocol suite. Logical link control is implemented in software.
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?
latency
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
