CCNA Ch. 5 Exam

What are the two sized of an ethernet frame?

-64 bytes -1518 bytes

Which two statements describe features or functions of the logical link control sublayer in ethernet standards?

-Logical link control is implemented in software -The data link layer uses LLC to communicate with upper layers of the protocol suite

What are two potential network problems that can result from ARP operation?

-On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays -Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic

Store-and-forward

-always stores the entire frame -checks the CRC before forwarding -checks the frame length before forwarding

Cut-Through

-has low latency -may forward runt frames -begins forwarding when the destination address is received

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

64 bytes

What is auto-MDIX?

A feature that detects Ethernet cable type

Which destination address is used in an ARP request frame?

FFFF.FFFF.FFFF

What is a characteristic of port-based memory buffering?

Frames are buffered in queues linked to specific ports

Refer to the exhibit. A switch with a default configuration connects four hosts. The ARP table for host A is shown. What happens when host A wants to send an IP packet to host D?

Host A sends a broadcast of FF:FF:FF:FF:FF:FF. Every other host connected to the switch receives the broadcast and host D responds with its MAC address

What statement describes Ethernet?

It defines the most common LAN type in the world

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

Layer 3 address to a layer 2 address

Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?

PC2 will send an ARP reply with its MAC address

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

Runt

ARP _____ is a technique that is used to send fake ARP messages to other hosts in the LAN. The aim is to associate IP address to the wrong Mac addresses.

Spoofing

Which statement is true about MAC addresses?

The first three bytes are used by the vendor assigned OUI

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

The frame is dropped

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

The source layer 2 address of incoming frames

Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frames?

The switch will forward the frame to all ports except port 4

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

They are received and processed by every device on the local network

What statement describes a characteristic of MAC address?

They must be globally unique

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 or False?

True

Refer to the exhibit. The switches are in their default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?

only hosts B, C, and router R1

On a cisco switch, ______ memory buffering is used to buffer frames in queues linked to specific incoming and outgoing ports.

port-based

Which switching method uses the CRC value in a frame?

store-and-forward

What is the aim of an ARP spoofing attack?

to associate IP address to the wrong MAC address