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Questions and Answers
Which destination address is used in an ARP request frame?
Which destination address is used in an ARP request frame?
Is this a characteristic of cut-through or store-and-forward? Always stores the entire frame.
Is this a characteristic of cut-through or store-and-forward? Always stores the entire frame.
store-and-forward
Is this a characteristic of cut-through or store-and-forward? Checks the CRC before forwarding.
Is this a characteristic of cut-through or store-and-forward? Checks the CRC before forwarding.
store-and-forward
Is this a characteristic of cut-through or store-and-forward? Checks the frame length before forwarding.
Is this a characteristic of cut-through or store-and-forward? Checks the frame length before forwarding.
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Is this a characteristic of cut-through or store-and-forward? Does not forward broadcasts.
Is this a characteristic of cut-through or store-and-forward? Does not forward broadcasts.
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Is this a characteristic of cut-through or store-and-forward? Has low latency.
Is this a characteristic of cut-through or store-and-forward? Has low latency.
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Is this a characteristic of cut-through or store-and-forward? May forward runt frames.
Is this a characteristic of cut-through or store-and-forward? May forward runt frames.
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Is this a characteristic of cut-through or store-and-forward? Begins forwarding when the destination address is received.
Is this a characteristic of cut-through or store-and-forward? Begins forwarding when the destination address is received.
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The ARP table in a switch maps which two types of addresses together?
The ARP table in a switch maps which two types of addresses together?
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Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)
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ARP ____________ is a technique that is used to send fake ARP messages to other hosts in the LAN.
ARP ____________ is a technique that is used to send fake ARP messages to other hosts in the LAN.
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What happens to runt frames received by a Cisco Ethernet switch?
What happens to runt frames received by a Cisco Ethernet switch?
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What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)
What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)
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What is auto-MDIX?
What is auto-MDIX?
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On a Cisco switch, _____________ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.
On a Cisco switch, _____________ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.
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Which statement describes the treatment of ARP requests on the local link?
Which statement describes the treatment of ARP requests on the local link?
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What statement describes a characteristic of MAC addresses?
What statement describes a characteristic of MAC addresses?
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When a device is sending data to another device on a remote network, the Ethernet frame is sent to the MAC address of the default gateway.
When a device is sending data to another device on a remote network, the Ethernet frame is sent to the MAC address of the default gateway.
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What are two potential network problems that can result from ARP operation? (Choose two.)
What are two potential network problems that can result from ARP operation? (Choose two.)
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A collision fragment, also known as a _______ frame, is a frame of fewer than 64 bytes in length.
A collision fragment, also known as a _______ frame, is a frame of fewer than 64 bytes in length.
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Which statement is true about MAC addresses?
Which statement is true about MAC addresses?
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What addressing information is recorded by a switch to build its MAC address table?
What addressing information is recorded by a switch to build its MAC address table?
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What statement describes Ethernet?
What statement describes Ethernet?
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Which switching method uses the CRC value in a frame?
Which switching method uses the CRC value in a frame?
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When a network device wants to communicate with another device on the same network, it sends a ____________ _____ _________.
When a network device wants to communicate with another device on the same network, it sends a ____________ _____ _________.
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The destination device of a broadcast ARP request containing the IP in the request, sends an ________ ______ with its MAC address.
The destination device of a broadcast ARP request containing the IP in the request, sends an ________ ______ with its MAC address.
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Ethernet operates in which layer or layers?
Ethernet operates in which layer or layers?
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The Ethernet protocol standards define many aspects of network communication including frame format, frame size, timing, and encoding.
The Ethernet protocol standards define many aspects of network communication including frame format, frame size, timing, and encoding.
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The OSI model separates the data link layer functionalities of addressing, framing, and accessing the media from the physical layer standards.
The OSI model separates the data link layer functionalities of addressing, framing, and accessing the media from the physical layer standards.
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Ethernet is a family of networking technologies that are defined in the IEEE 802.2 and 802.3 standards.
Ethernet is a family of networking technologies that are defined in the IEEE 802.2 and 802.3 standards.
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The Ethernet LLC sublayer handles the communication between?
The Ethernet LLC sublayer handles the communication between?
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LLC is implemented in __________ , and its implementation is independent of the __________.
LLC is implemented in __________ , and its implementation is independent of the __________.
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MAC constitutes the lower sublayer of the data link layer.
MAC constitutes the lower sublayer of the data link layer.
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Frame delimiting, addressing, and error detection are all examples of?
Frame delimiting, addressing, and error detection are all examples of?
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Control of frame placement on and off the media and media recovery are both examples of?
Control of frame placement on and off the media and media recovery are both examples of?
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The Ethernet MAC sublayer has two primary responsibilities; what are they?
The Ethernet MAC sublayer has two primary responsibilities; what are they?
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The data encapsulation process includes frame assembly ___________ transmission over the media.
The data encapsulation process includes frame assembly ___________ transmission over the media.
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Frame dis-assembly happens at the host or source?
Frame dis-assembly happens at the host or source?
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The framing process provides important delimiters that are used to identify a group of bits that make up a frame. This is known as what term in data encapsulation?
The framing process provides important delimiters that are used to identify a group of bits that make up a frame. This is known as what term in data encapsulation?
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The encapsulation process contains the Layer 3 PDU and also provides for data link layer addressing. This is known as what term in data encapsulation?
The encapsulation process contains the Layer 3 PDU and also provides for data link layer addressing. This is known as what term in data encapsulation?
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Each frame contains a trailer used to detect any errors in transmissions. This is known as what term in data encapsulation?
Each frame contains a trailer used to detect any errors in transmissions. This is known as what term in data encapsulation?
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What data link sublayer is responsible for the placement of frames on the media and the removal of frames from the media?
What data link sublayer is responsible for the placement of frames on the media and the removal of frames from the media?
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A contention-based method means what?
A contention-based method means what?
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The latest versions of Ethernet operate at what speed?
The latest versions of Ethernet operate at what speed?
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The preamble (7 bytes) and start frame delimiter (SFD), also called the start of frame (1 byte), fields are used for synchronization between the sending and receiving devices.
The preamble (7 bytes) and start frame delimiter (SFD), also called the start of frame (1 byte), fields are used for synchronization between the sending and receiving devices.
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The minimum Ethernet frame size is 64 bytes and the maximum is 1518 bytes. This includes all bytes from the destination MAC address field through the frame check sequence (FCS) field.
The minimum Ethernet frame size is 64 bytes and the maximum is 1518 bytes. This includes all bytes from the destination MAC address field through the frame check sequence (FCS) field.
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Any frame less than 64 bytes in length is considered a collision fragment or runt frame and is automatically discarded by receiving stations.
Any frame less than 64 bytes in length is considered a collision fragment or runt frame and is automatically discarded by receiving stations.
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Ethernet frame field, what is it?
Ethernet frame field, what is it?
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Study Notes
ARP and MAC Addresses
- ARP (Address Resolution Protocol) uses the destination address FFFF.FFFF.FFFF in request frames for Layer 2 broadcast on an Ethernet LAN.
- The ARP table in switches maps Layer 3 addresses (IP) to Layer 2 addresses (MAC).
- A broadcast ARP request prompts a reply with the destination device's MAC address.
Ethernet Switching Methods
- Store-and-forward switching always stores the entire frame and checks the CRC and frame length before forwarding.
- Cut-through switching has low latency, may forward runt frames, and begins forwarding as soon as the destination address is received.
Features of LLC and MAC Layers
- The Logical Link Control (LLC) sublayer facilitates communication between the data link layer and upper layers of the protocol suite; it is implemented in software.
- MAC (Media Access Control) is implemented by hardware in the NIC and is responsible for addressing, framing, and controlling access to the media.
Frame Specifications
- Ethernet frames have a minimum size of 64 bytes and a maximum size of 1518 bytes, excluding the Preamble.
- Collision fragments or runt frames are under 64 bytes and are automatically discarded by switches.
Ethernet Characteristics
- MAC addresses must be globally unique, with the first three bytes assigned as the Organizationally Unique Identifier (OUI).
- Ethernet defines the most common LAN type in the world and operates at both the data link and physical layers.
Error Handling and Frame Delimiting
- Frames include trailers for error detection and utilize frame delimiting for synchronization between nodes.
- The frame assembly process occurs at the host, while the encapsulation process provides addressing for the data link layer.
Potential Network Issues Related to ARP
- Network attackers can manipulate MAC and IP mappings leading to interception of traffic.
- Excessive ARP broadcasts can cause delays in data communication on networks with low bandwidth.
Auto-MDIX and Memory Buffering
- Auto-MDIX is a feature that detects the type of Ethernet cable used.
- Cisco switches use port-based memory buffering to manage frames specific to ports.
Communication Process
- When devices on the same network communicate, a broadcast ARP request is sent to resolve IP addresses.
- Responses and actions taken regarding ARP requests are processed by all devices on the local network.
Studying That Suits You
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Description
Test your knowledge of Ethernet concepts with flashcards from Chapter 5. This quiz focuses on ARP request frames and their purpose in discovering MAC addresses on an Ethernet LAN. Enhance your understanding of networking fundamentals through this interactive resource.
