Ethernet Networking Basics

Questions and Answers

What is the minimum Ethernet frame size that will not be discarded by the receiver as a runt frame?

64 Bytes

What is a characteristic of port-based memory buffering?

Frames are buffered in queues linked to specific ports

What is the aim of an ARP spoofing attack?

To associate IP addresses to wrong MAC addresses

What happens to runt frames received by a Cisco Ethernet switch?

Frame is dropped Signup and view all the answers

What are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)

1518 Bytes Signup and view all the answers

What statement describes Ethernet?

Describes most common LAN type in the World Signup and view all the answers

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. Signup and view all the answers

What statement describes a characteristic of MAC addresses?

Must be globally unique Signup and view all the answers

Which statement is true about MAC addresses?

The first three bytes are used by the vendor assigned OUI. Signup and view all the answers

Which destination address is used in an ARP request frame?

FFFF.FFFF.FFFF Signup and view all the answers

What addressing information is recorded by a switch to build its MAC address table?

The source Layer 2 address of incoming frames Signup and view all the answers

What will the switch do with the frame sent from PC1 addressed to PC3?

The switch will forward the frame to all ports except port 4. Signup and view all the answers

Which switching method uses the CRC value in a frame?

Store-and-forward Signup and view all the answers

What is auto-MDIX?

A feature that detects Ethernet cable type Signup and view all the answers

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.

True Signup and view all the answers

The ARP table in a switch maps which two types of address together?

Layer 3 address to a Layer 2 address Signup and view all the answers

What will happen after PC1 issues an ARP request to send a packet to PC2?

PC2 will send an ARP reply with its MAC address. Signup and view all the answers

What happens when host A wants to send an IP packet to host D?

Host A sends out a broadcast of FF:FF:FF:FF:FF:FF. Signup and view all the answers

Which network hosts will receive the ARP request sent by host A without having the MAC address for its default gateway?

Only hosts B, C, and router R1. Signup and view all the answers

What statement describes the treatment of ARP requests on the local link?

They are received and processed by every device on the local network. Signup and view all the answers

What are two potential network problems that can result from ARP operation? (Choose two.)

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic. Signup and view all the answers

A collision fragment, also known as a frame, is a frame of fewer than 64 bytes in length?

RUNT Signup and view all the answers

On a Cisco switch, memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports?

Port-based Signup and view all the answers

ARP is a technique that is used to send fake ARP messages to other hosts in the LAN. What is the aim?

Spoofing Signup and view all the answers

Study Notes

Ethernet Frame Size and Characteristics

Minimum size for an Ethernet frame to avoid being discarded as a runt frame is 64 bytes.
Maximum Ethernet frame size is 1518 bytes.
Runt frames are dropped by Cisco Ethernet switches.

Memory Buffering and Addressing

Port-based memory buffering involves storing frames in queues specific to each port.
The ARP (Address Resolution Protocol) table in a switch maps Layer 3 IP addresses to Layer 2 MAC addresses.
MAC addresses must be globally unique, with the first three bytes representing a vendor-assigned Organizationally Unique Identifier (OUI).

ARP Protocol and Network Communication

The destination address for an ARP request frame is FF:FF:FF:FF:FF:FF (broadcast address).
When a device needs to communicate with another on a different network, the Ethernet frame is sent to the MAC address of the default gateway.
ARP requests are processed by every device on the local network.

Switching Methods and Functions

The store-and-forward switching method utilizes the CRC (Cyclic Redundancy Check) value in incoming frames.
A switch will forward frames to all ports except the receiving port if the destination is unknown.
Logical Link Control (LLC) operates in software at the data link layer, facilitating communication with higher protocol layers.

Network Issues and Security

Potential problems from ARP include communication delays due to multiple broadcasts and vulnerabilities to ARP spoofing attacks, where attackers manipulate address mappings to intercept traffic.
A collision fragment (or runt) refers to a frame less than 64 bytes, which can disrupt network operations.

Auto-MDIX Feature

Auto-MDIX is a feature that automatically detects the type of Ethernet cable used in connections.

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Description

Test your knowledge on Ethernet frame sizes, memory buffering, and the ARP protocol. This quiz covers essential concepts related to network communication and switching methods. Perfect for anyone looking to strengthen their understanding of Ethernet technology.