Chapter 5
shared memory buffering
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?
Runt
A collision fragment, also known as a ______ frame, is a frame of fewer than 64 bytes in length.
Carrier Sense Multiple Access
CSMA, provides a method for controlling how the nodes share access
CSMA-CA
Device examines the media for the presence of data signal if free the device sends a notification across the media of its intent to use it
data encapsulation
Frame assembly before transmission and frame disassembles upon reception of a frame
H1 sends a unicast message to H2, and the switch forwards it directly to H2.
H2 has sent a broadcast message to all of the hosts. If host H1 wants to reply to the broadcast message, which statement is true?
Arp -a and show ip arp
How do you show the ARP table on a Cisco router and a Windows 7 pc?
Media Access Control
MAC address, responsible for the placement of frames on the media and the removal of frames from the media
Broadcast
On Ethernet networks, the hexadecimal address FF-FF-FF-FF-FF-FF represents the ______ MAC address
No switchport
On a layer 3 switch what command turns on routing for a port?
RT1 will send an ARP reply with its own Fa0/0 MAC address.
PC1 issues an ARP request because it needs to send a packet to PC3. In this scenario, what will happen next?
MAC
The Ethernet ________ sublayer is responsible for communicating directly with the physical layer.
0A or A
The binary number 0000 1010 can be expressed as ________ in hexadecimal
64
The minimum Ethernet frame size is
Runs as one giant switch, connects by cable
What are the advantages and disadvantages of stackable switches?
Must use vendors assigned OUI as the first three bytes and All MAC addresses with the same OUI must be assigned a unique value in the last three bytes
What are the rules to making a MAC addresses?
Dashes, Colons, and periods
What are the three ways a MAC address can be displayed?
Store-and-forward switching and cut-through switching
What are the two types of frame forwarding?
Fast-forward switching and fragment-free switching
What are the two variants of cut-through forwarding?
It drops the frame
What does the receiving device do with a runt frame?
Carrier Sense Multiple Access, Ethernet provides a method for controlling how the nodes share access
What is CSMA and what does it do?
It is a nondeterministic method.
What is a characteristic of a contention-based access method?
63
What is the decimal equivalent of the hexadecimal value of 3F?
192.168.1.255
What is the destination IP address for a Broadcast?
FF-FF-FF-FF-FF-FF
What is the destination MAC address for a Broadcast?
00-60-2F-3A-07-CC
What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1?
Layer 3 learns which IP addresses are associated with interfaces while Layer 2 does not
What is the difference between a Layer 2 and 3 switch?
MAC is assigned to host NIC and does not change while IP changes depending on location of host
What is the difference between a MAC and IP address?
FFFF.FFFF.FFFF
Which destination address is used in an ARP request frame?
no switchport
Which interface command must be entered in a Layer 3 switch before an IPv4 address can be assigned to that interface?
forwarding rate
Which term defines the processing capabilities of a switch by rating how much data can be processed per second?
It is responsible for Media Access Control It adds a header and trailer to form an OSI Layer 2 PDU.
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 two functions or operations are performed by the MAC sublayer? (Choose two.)
frame delimiting
identifies a group of bits that make up a frame, synchronization between the transmitting and receiving nodes
CSMA-CD
if media is free sends data and if data signal is detected it stops and tries again later
MDIX
switch detects the required cable type for copper Ethernet connections and configures the interfaces accordingly
48-bit
How long is the binary value of a MAC address?
12
How many hexadecimal digits are in a MAC address?
Cyclic redundancy check
In the frame what is used for error detection?
LLC handles communication on the upper and lower layers while MAC constitutes the lower sublayer of the data link layer
What is the different between the LLC and the MAC sublayers?
64 bytes minimum and 1,518 maximum
What is the max and minimum size for frames?
resolve IPv4 addresses to MAC addresses
What is the primary purpose of ARP?
Sending node needs a way to find the MAC address of the destination for a given Ethernet link
What is the purpose of ARP?
an address that reaches a specific group of hosts
What type of address is 01-00-5E-0A-00-02?
store-and-forward
When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached?
CRC in the trailer
When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?
It sends the frame to all ports except the port on which it received the frame
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?
It sends the frame to all ports except the port on which it received the frame.
Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?
