Chapter 5

What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224.139.34.56?

01-00-5E-0B-22-38

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

64 bytes and 1518 bytes

The binary number 1010 can be expressed as what in hexadecimal?

A

What is auto-MDIX?

A feature that detects Ethenet cable type

Which two statements describe a fixed configuration Ethernet switch?

A fixed configuration switch may be stackable. The number of ports on the switch cannot be increased.

What statement illustrates a drawback of the CSMA/CD access method?

Collisions can decrease network performance.

Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved?

Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another. Destination IP addresses in a packet header remain constant along the entire path to a target host.

What are two features of ARP?

If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast. If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.

What statement describes Ethernet?

It defines the most common LAN type in the world

What is a characteristic of a contention-based access method?

It is a nondeterministic method.

A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?

It will send an ARP request for the MAC address of the default gateway.

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

Layer 3 address to a Layer 2 address

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 the upper layers of the protocol suite.

Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?

MAC and IP addresses

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.

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

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

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

port based

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

runt

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?

shared memory buffering

Which switching method uses the CRC value in a frame?

store-and-forward

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

the source Layer 2 address of incoming frames

Which destination address is used in an ARP request frame?

FFFF.FFFF.FFFF

Field 1 Field 2 Field 3 Field 4 Field 5 Field 6 Field 7

Preamble Start Frame Delimeter Destination MAC Address Source MAC Address Length/Type Encapsulated Data Frame Check Sequence

A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection?

The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. The link between switches will work as full-duplex. The link between the switches will work at the fastest speed that is supported by both switches.

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 statement describes a characteristic of MAC addresses?

They must be globally unique

A network administrator issues the following commands on a Layer 3 switch: DLS1(config)# interface f0/3 DLS1(config-if)# no switchport DLS1(config-if)# ip address 172.16.0.1 255.255.255.0 DLS1(config-if)# no shutdown DLS1(config-if)# end What is the administrator configuring?

a routed port

How does adding an Ethernet line card affect the form factor of a switch?

by expanding the port density

What is the purpose of the preamble in an Ethernet frame?

it is used for timing synchronization

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

spoofing

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

When would a switch record multiple entries for a single switch port in its MAC address table?

when another switch is connected to the switch port