Module 7: Ethernet Switching
What is the special value assigned to the first 24 bits of a multicast MAC address transporting an IPv4 packet?
01-00-5E
What is a function of the MAC sublayer? (Choose three.)
1. Controls access to the media 2. Checks for errors in received bits 3. Uses CSMA/CD or CSMA/CA to support Ethernet technology
Which two characteristics describe Ethernet technology? (Choose two.)
1. It is supported by IEEE 802.3 standards. 2. It uses unique MAC addresses to ensure that data is sent to the appropriate destination.
Which two types of memory buffering techniques are used by switches? (Choose two.)
1. Port-based memory buffering 2. Shared memory buffering
What are the two sizes (minimum and expected maximum) of an Ethernet frame? (Choose two.)
64 - 1518 bytes
What is auto-MDIX?
A feature that detects Ethernet cable type
What type of address is 01-00-5E-0A-00-02?
An address that reaches a specific group of hosts
Which part of an Ethernet Frame uses a pad to increase the frame field to at least 64 bytes?
Data Field
Which part of an Ethernet Frame describes the higher-layer protocol that is encapsulated?
ETherType
Which function or operation is performed by the LLC sublayer?
It communicates with upper protocol layers.
Which two functions or operations are performed by the MAC sublayer? (Choose two.)
It is responsible for Media Access Control., It adds a header and trailer to form an OSI Layer 2 PDU.
Which data link sublayer controls the network interface through software drivers?
LLC
Which data link sublayer works with the upper layers to add application information for delivery of data to higher level protocols?
LLC
Which statement is true about MAC addresses?
The first three bytes are used by the vendor assigned OUI.
What addressing information is recorded by a switch to build its MAC address table?
The source Layer 2 address of incoming frames
What feature automatically negotiates the best speed and duplex setting between interconnecting devices?
autonegotiation
What are two methods for switching data between ports on a switch? (Choose two.)
cut-through and store-and-forward switching
Which switching method can be implemented using fast-forward switching or fragment-free switching?
cut-through switching
Which part of an Ethernet frame detects errors in the frame?
frame check sequence
What will a host on an Ethernet network do if it receives a frame with a unicast destination MAC address that does not match its own MAC address?
it will discard the frame
Which part of an Ethernet Frame notifies the receiver to get ready for a new frame?
preamble
Which network device has the primary function to send data to a specific destination based on the information found in the MAC address table?
switch
Which network device makes forwarding decisions based on the destination MAC address that is contained in the frame?
switch
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
