Exam 2
crosstalk, electromagnetic interference
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables?
throughput
What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?
The switch forwards it out all ports except the ingress port.
What action will occur if a switch receives a frame with the destination MAC address 01:00:5E:00:00:D9?
1. Ethernet utilizes CSMA/CD. 2. Media access control provides placement of data frames onto the media. 3. Data link layer protocols define the rules for access to different media.
What are three ways that media access control is used in networking? (Choose three.)
using the source MAC addresses of frames to build and maintain a MAC address table utilizing the MAC address table to forward frames via the destination MAC address
What are two actions performed by a Cisco switch?
fast-forward switching, fragment-free switching
What are two examples of the cut-through switching method?
loss of signal strength as distance increases
What does the term "attenuation" mean in data communication?
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media
What is a characteristic of the LLC sublayer?
error detection
What is contained in the trailer of a data-link frame?
the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection Explanation: The auto-MDIX enables a switch to use a crossover or a straight-through Ethernet cable to connect to a device regardless of the device on the other end of the connection.
What is the auto-MDIX feature on a switch?
It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
What is the auto-MDIX feature?
to determine if errors occurred in the transmission and reception
What is the purpose of the FCS field in a frame?
greater distances per cable run, limited susceptibility to EMI/RFI, greater bandwidth potential
What makes fiber preferable to copper cabling for interconnecting buildings?
destination MAC address error-checking information source MAC address
What three items are contained in an Ethernet header and trailer? (Choose three.)
CRC in the trailer Explanation: The cyclic redundancy check (CRC) part of the trailer is used to determine if the frame has been modified during transit. If the integrity of the frame is verified, the frame is forwarded. If the integrity of the frame cannot be verified, then the frame is dropped.
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
01-00-5E-00-00-03
Which is a multicast MAC address?
Full Duplex
Which media communication type does not require media arbitration in the data link layer?
They vary depending on protocols
Which statement describes a characteristic of the frame header fields of the data link layer?
All network devices must listen before transmitting
Which statement is true about the CSMA/CD access method that is used in Ethernet?
fast-forward
Which switching method has the lowest level of latency?
1.It packages various Layer 3 PDUs into a frame format that is compatible with the network interface. 2. It manages the access of frames to the network media. The data link layer is divided into two sub layers, namely Logical Link Control (LLC) and Media Access Control (MAC). LLC forms a frame from the network layer PDU into a format that conforms to the requirements of the network interface and media. A network layer PDU might be for IPv4 or IPv6. The MAC sub layer defines the media access processes performed by the hardware. It manages the frame access to the network media according to the physical signaling requirements (copper cable, fiber optic, wireless, etc.)
Which two statements describe the services provided by the data link layer?
the magnetic field around the adjacent pairs of wire
With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?
frame error checking Explanation: A switch using the store-and-forward switching method performs an error check on an incoming frame by comparing the FCS value against its own FCS calculations after the entire frame is received. In comparison, a switch using the cut-through switching method makes quick forwarding decisions and starts the forwarding process without waiting for the entire frame to be received. Thus a switch using cut-through switching may send invalid frames to the network. The performance of store-and-forward switching is slower compared to cut-through switching performance. Collision detection is monitored by the sending device. Store-and-forward switching does not use IPv4 Layer 3 and 4 information for its forwarding decisions.
Which advantage does the store-and-forward switching method have compared with the cut-through switching method?
store-and-forward
Which switching method uses the CRC value in a frame?
microwaves, cordless phones
Which two devices commonly affect wireless networks?
minimum frame size, frame check sequence
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?
Enables IPv4 and IPv6 to utilize the same network interface and media. Navigation Bar
Which two functions are performed at the LLC sublayer of the OSI data link layer?
Enables IPv4 and IPv6 to utilize the same network interface and media. Navigation Bar
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
