v1
What is the function of the CRC value that is found in the FCS field of a frame?
What is to verify the integrity of the received frame
The CRC value in the FCS field of the received frame is compared to the computed CRC value of that frame, in order to verify the integrity of the frame. If the two values do not match, then the frame is discarded.
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ITN
1.6.3 Data Link Frame
Which media communication type does not require media arbitration in the data link layer?
What is full-duplex
Half-duplex communication occurs when both devices can both transmit and receive on the medium but cannot do so simultaneously. Full-duplex communication occurs when both devices can transmit and receive on the medium at the same time and therefore does not require media arbitration. Half-duplex communication is typically contention-based, whereas controlled (deterministic) access is applied in technologies where devices take turns to access the medium.
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ITN
1.6.2 Topologies
What type of communication rule would best describe CSMA/CD?
What is access method
Carrier sense multiple access collision detection (CSMA/CD) is the access method used with Ethernet. The access method rule of communication dictates how a network device is able to place a signal on the carrier. CSMA/CD dictates those rules on an Ethernet network and CSMA/CA dictates those rules on an 802.11 wireless LAN.
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ITN
1.6.2 Topologies
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
What is loss of signal strength as distance increased
Data is transmitted on copper cables as electrical pulses. A detector in the network interface of a destination device must receive a signal that can be successfully decoded to match the signal sent. However, the farther the signal travels, the more it deteriorates. This is referred to as signal attenuation.
ITN
4.3 Copper Cabling
What OSI physical layer term describes the capacity at which a medium can carry data?
-bandwidth
-IEEE
-EIA/TIA
-air
What is bandwidth
ITN 4.2 Physical Layer Characteristics
What is contained in the trailer of a data-link frame?
What is error detection
The trailer in a data-link frame contains error detection information that is pertinent to the frame included in the FCS field. The header contains control information, such as the addressing, while the area that is indicated by the word "data" includes the data, transport layer PDU, and the IP header.
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ITN
1.6.3 Data Link Frame
Which statement describes an extended star topology?
In an extended star topology, central intermediate devices interconnect other star topologies.
What is An extended star topology involves central intermediate devices connecting multiple star topologies.
ITN
1.6.2 Topologies
Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
What is header, data, trailer
The data link protocol is responsible for NIC-to-NIC communications within the same network. Although there are many different data link layer protocols that describe data link layer frames, each frame type has three basic parts:
Header
Data
Trailer
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ITN
1.6.2 Topologies
What OSI physical layer term describes the process by which one wave modifies another wave?
modulation
IEEE
EIA/TIA
air
What is modulation
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ITN
1.4.2 Physical Layer Characteristics
What OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?
-latency
-fiber-optic cable
-air
-copper cable
What is latency
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ITN
1.4.2 Physical Layer Characteristics
Which statement describes a characteristic of the frame header fields of the data link layer?
What is they vary depending on protocols
All data link layer protocols encapsulate the Layer 3 PDU within the data field of the frame. However, the structure of the frame and the fields that are contained in the header vary according to the protocol. Different data link layer protocols may use different fields, like priority/quality of service, logical connection control, physical link control, flow control, and congestion control.
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ITN
1.6.3 Data Link Frame
What is a characteristic of the Logical Link Control (LLC) sublayer?
The Logical Link Control (LLC) places information in the frame to identify which network layer protocol is being used, allowing multiple Layer 3 protocols to share the same network interface and media.
The Logical Link Control (LLC) defines the software processes that provide services to the network layer protocols. The information is placed by LLC in the frame and identifies which network layer protocol is being used for the frame. This information allows multiple Layer 3 protocols, such as IPv4 and IPv6, to utilize the same network interface and media.
6.1 Purpose of the Data Link Layer
Which statement is true about the CSMA/CD access method that is used in Ethernet?
-When a device hears a carrier signal and transmits, a collision cannot occur.
-A jamming signal causes only devices that caused the collision to execute a backoff algorithm.
-All network devices must listen before transmitting.
-Devices involved in a collision get priority to transmit after the backoff period.
What is All network devices must listen before transmitting.
Legacy bus-topology Ethernet LAN uses CSMA/CD as network media access control protocol. It works by detecting a collision in the medium and backing off (after transmitting a jam signal) as necessary. When one host wants to transmit a frame, it listens on the medium to check if the medium is busy. After it senses that no one else is transmitting, the host starts transmitting the frame, it also monitors the current level to detect a collision. If it detects a collision, it transmits a special jam signal so that all other hosts can know there was a collision. The other host will receive this jam signal and stop transmitting. After this, both hosts enter an exponential backoff phase and retry transmission.
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ITN
1.6.2 Topologies
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
-Adds Layer 2 control information to network protocol data.
-Enables IPv4 and IPv6 to utilize the same network interface and media.
-Provides data link layer addressing.
-Implements a trailer to detect transmission errors.
-Provides synchronization between source and target nodes.
What is Adds Layer 2 control information to network protocol data.
&
Enables IPv4 and IPv6 to utilize the same network interface and media.
6.1 Purpose of the data link layer
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.
-Places information in the frame that identifies which network layer protocol is being used for the frame.
-Enables IPv4 and IPv6 to utilize the same network interface and media.
-Adds Layer 2 control information to network protocol data.
What is Implements a trailer to detect transmission errors.
&
Provides synchronization between source and target nodes.
ITN
6.1 Purpose of the Data Link layer
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?
What is partial mesh
Partial mesh topologies provide high availability by interconnecting multiple remote sites, but do not require a connection between all remote sites. A mesh topology requires point-to-point links with every system being connected to every other system. A point-to-point topology is where each device is connected to one other device. A hub and spoke uses a central device in a star topology that connects to other point-to-point devices.
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ITN
1.6.2 Topologies
What are the different ways that media access control is utilized in networking?
What is CSMA/CD? (Ethernet uses this method to avoid data collisions)
What is frame placement onto the media? (Media access control involves the placement of data frames onto the media)
What is reduced performance due to data collisions? (Networks with controlled access may experience this issue)
Wired Ethernet networks use CSMA/CD for media access control. IEEE 802.11 wireless networks use CSMA/CA, a similar method. Media access control defines the way data frames get placed on the media. The controlled access method is deterministic, not a contention-based access to networks. Because each device has its own time to use the medium, controlled access networks such as legacy Token Ring do not have collisions.
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ITN
1.6.2 Topologies
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.
-Places information in the frame that identifies which network layer protocol is being used for the frame.
-Integrates various physical technologies.
-Implements a process to delimit fields within a Layer 2 frame.
-Controls the NIC responsible for sending and receiving data on the physical medium.
What is Enables IPv4 and IPv6 to utilize the same network interface and media.
&
Places information in the frame that identifies which network layer protocol is being used for the frame.
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ITN
1.6.1 Purpose of the Data Link Layer
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.
Controls the NIC responsible for sending and receiving data on the physical medium.
&
Integrates various physical technologies.
ITN
1.6.1 Purpose of the Data Link Layer
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
-Provides synchronization between source and target nodes.
-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.
-Enables IPv4 and IPv6 to utilize the same network interface and media.
What is Provides synchronization between source and target nodes.
&
Integrates various physical technologies.
ITN
1.6.1 Purpose of the Data Link Layer
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.)
What is frame check sequence & minimum frame size
An Ethernet frame is not processed and is discarded if it is smaller than the minimum (64 bytes) or if the calculated frame check sequence (FCS) value does not match the received FCS value. Auto-MDIX (automatic medium-dependent interface crossover) is Layer 1 technology that detects cable straight-through or crossover types. The source MAC address is not used to determine how the frame is received. CEF (Cisco Express Forwarding) is a technology used to expedite Layer 3 switching.
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ITN
1.7.1 Ethernet Frames
During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
What is The physical address is added.
The Ethernet frame includes the source and destination physical address. The trailer includes a CRC value in the Frame Check Sequence field to allow the receiving device to determine if the frame has been changed (has errors) during the transmission.
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ITN
1.6.3 Data Link Frame
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
-Implements a trailer to detect transmission errors.
-Controls the NIC responsible for sending and receiving data on the physical medium.
-Places information in the frame that identifies which network layer protocol is being used for the frame.
-Adds Layer 2 control information to network protocol data.
-Enables IPv4 and IPv6 to utilize the same network interface and media.
What is Implements a trailer to detect transmission errors.
&
Controls the NIC responsible for sending and receiving data on the physical medium.
This item references content from the following areas:
ITN
1.6.1 Purpose of the Data Link Layer
Which two functions are performed at the MAC sublayer of the OSI data link layer? (Choose two.)
-Provides a mechanism to allow multiple devices to communicate over a shared medium.
-Controls the NIC responsible for sending and receiving data on the physical medium.
-Places information in the frame that identifies which network layer protocol is being used for the frame.
-Adds Layer 2 control information to network protocol data.
-Communicates between the networking software at the upper layers and the device hardware at the lower layers.
What is Provides a mechanism to allow multiple devices to communicate over a shared medium.
&
Controls the NIC responsible for sending and receiving data on the physical medium.
ITN
1.6.1 Purpose of the Data Link Layer
Which two functions are performed at the LLC sublayer of the OSI data link layer? (Choose two.)
-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.
-Performs data encapsulation.
-Controls the NIC responsible for sending and receiving data on the physical medium.
-Integrates various physical technologies.
What is 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.
ITN
1.6.1 Purpose of the Data Link Layer