Modules 4 - 7: Ethernet Concepts
What are two characteristics of fiber-optic cable? (Choose two.) - It typically contains 4 pairs of fiber-optic wires. - It combines the technique of cancellation, shielding, and twisting to protect data. - It is more expensive than UTP cabling is. - It is not affected by EMI or RFI. - Each pair of cables is wrapped in metallic foil.
- It is not affected by EMI or RFI. - It is more expensive than UTP cabling is.
Which two statements describe the services provided by the data link layer? (Choose two.) - It defines the end-to-end delivery addressing scheme. - It maintains the path between the source and destination devices during the data transmission. - It manages the access of frames to the network media. - It provides reliable delivery through link establishment and flow control. - It ensures that application data will be transmitted according to the prioritization. - 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. - It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.
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. - Integrates various physical technologies. - Communicates between the networking software at the upper layers and the device hardware at the lower layers. - Adds Layer 2 control information to network protocol data. - Places information in the frame that identifies which network layer protocol is being used for the frame. - Provides a mechanism to allow multiple devices to communicate over a shared medium. - Implements a trailer to detect transmission errors. - Provides synchronization between source and target nodes. - Enables IPv4 and IPv6 to utilize the same network interface and media.
- Provides a mechanism to allow multiple devices to communicate over a shared medium. - Integrates various physical technologies. - Controls the NIC responsible for sending and receiving data on the physical medium. - Provides synchronization between source and target nodes. - Implements a trailer to detect transmission errors
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.) - Logical link control is implemented in software. - Logical link control is specified in the IEEE 802.3 standard. - The LLC sublayer adds a header and a trailer to the data. - The data link layer uses LLC to communicate with the upper layers of the protocol suite. - The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.
- The data link layer uses LLC to communicate with the upper layers of the protocol suite. - Logical link control is implemented in software.
Match the situation with the appropriate use of network media. - backbone cabling in an enterprise - guest access in a coffee shop - horizontal cabling structure - waiting rooms in a hospital - desktop PCs in an enterprise office - long-haul networks - copper cables, fiber optic, wireless
- 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 coffeeshop waiting rooms in a hospital
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.) - bandwidth - crosstalk - signal modulation technique - size of the network - electromagnetic interference
- crosstalk - electromagnetic interference
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.) - greater distances per cable run - lower installation cost - limited susceptibility to EMI/RFI - durable connections - greater bandwidth potential - easily terminated
- greater bandwidth potential - limited susceptibility to EMI/RFI - greater distances per cable run
What three items are contained in an Ethernet header and trailer? (Choose three.) - source IP address - source MAC address - destination IP address - destination MAC address - error-checking information
- source MAC address - destination MAC address
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 sophistication of the encapsulation method applied to the data - 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 - the bandwidth of the WAN connection to the Internet - the reliability of the gigabit Ethernet infrastructure of the backbone
- 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 - the amount of traffic that is currently crossing the network
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-AA - 00-60-2F-3A-07-BB - 00-60-2F-3A-07-CC - 00-60-2F-3A-07-DD
00-60-2F-3A-07-CC
Which is a multicast MAC address? - FF-FF-FF-FF-FF-FF - 5C-26-0A-4B-19-3E - 01-00-5E-00-00-03 - 00-26-0F-4B-00-3E
01-00-5E-00-00-03
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 - crossover, 3 - straight-through - 1 - rollover, 2 - straight-through, 3 - crossover - 1 - crossover, 2 - straight-through, 3 - rollover - 1 - crossover, 2 - rollover, 3 - straight-through
1 - rollover, 2 - straight-through, 3 - crossover
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 - crossover, 2 - straight-through, 3 - rollover 1 - rollover, 2 - crossover, 3 - straight-through 1 - crossover, 2 - rollover, 3 - straight-through 1 - rollover, 2 - straight-through, 3 - crossover
1 - rollover, 2 - straight-through, 3 - crossover
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 - source MAC address in the header - destination MAC address in the header - protocol type in the header
CRC (Cyclic Redundancy Check) in the trailer
Which port does Switch0 use to send frames to the host with the IPv4 address 10.1.1.5? - Fa0/1 - Fa0/5 - Fa0/9 - Fa0/11
Fa0/11 Steps: 1. Go to PC0, command, type ipconfig /all. View the MAC/physical address. 2. Go to Pc0 terminal. 3. Type show-mac-address-table 4. Find Mac/port entry that belongs to PC0. Do not select this one. 5. The other MAC/port entry belongs to the switch. This switch uses port Fa0/11.
What is the auto-MDIX feature? - It enables a device to automatically configure an interface to use a straight-through or a crossover cable. - It enables a device to automatically configure the duplex settings of a segment. - It enables a device to automatically configure the speed of its interface. - It enables a switch to dynamically select the forwarding method.
It enables a device to automatically configure an interface to use a straight-through or a crossover cable.
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. - The host sends the frame to the switch to update the MAC address table. - The host forwards the frame to the router. - The host forwards the frame to all other hosts.
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? - An IP address is added. - The logical address is added. - The physical address is added. - The process port number is added.
The physical address is added.
Refer to the exhibit. What is wrong with the displayed termination? - The woven copper braid should not have been removed. - The wrong type of connector is being used. - The untwisted length of each wire is too long. - The wires are too thick for the connector that is used.
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 all include the flow control and logical connection fields. - Ethernet frame header fields contain Layer 3 source and destination addresses. - They vary depending on protocols. - They include information on user applications.
They vary depending on protocols.
What type of communication rule would best describe CSMA/CD? - access method - flow control - message encapsulation - message encoding
access method
What OSI physical layer term describes the physical medium for microwave transmissions? - air - goodput - latency - throughput
air
Refer to the graphic. What type of cabling is shown? UTP STP fiber coax
coax
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 - determine the path packets take through the network - control data access to the media - provide physical addressing to the devices
create the signals that represent the bits in each frame on to the media
What is contained in the trailer of a data-link frame? - logical address - physical address - data - error detection
error detection
Which switching method has the lowest level of latency? - cut-through - store-and-forward - fragment-free - fast-forward
fast-forward
Which advantage does the store-and-forward switching method have compared with the cut-through switching method? - collision detecting - frame error checking - faster frame forwarding - frame forwarding using IPv4 Layer 3 and 4 information
frame error checking
Which media communication type does not require media arbitration in the data link layer? - deterministic - half-duplex - full-duplex - controlled access
full-duplex
What does the term "attenuation" mean in data communication? - loss of signal strength as distance increases - time for a signal to reach its destination - leakage of signals from one cable pair to another - strengthening of a signal by a networking device
loss of signal strength as distance increases
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? - mesh - partial mesh - hub and spoke - point-to-point
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? - port-based buffering - level 1 cache buffering - shared memory buffering - fixed configuration buffering
shared memory buffering
Which switching method uses the CRC value in a frame? - cut-through - fast-forward - fragment-free - store-and-forward
store-and-forward
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame? - cut-through switching - store-and-forward switching - fragment-free switching - fast-forward switching
store-and-forward switching
What is the auto-MDIX feature on a switch? - the automatic configuration of an interface for 10/100/1000 Mb/s operation - the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection - the automatic configuration of full-duplex operation over a single Ethernet copper or optical cable - the ability to turn a switch interface on or off accordingly if an active connection is detected
the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
What is the function of the Cyclic Redundancy Check (CRC) value that is found in the Frame Check Sequence (FCS) field of a frame? - to verify the integrity of the received frame - to verify the physical address in the frame - to verify the logical address in the frame - to compute the checksum header for the data field in the frame
to verify the integrity of the received frame
