Topic 3 Network Hardware Part 2 Switches_2 Flashcards
Every device that connects to a switch should have the same Network IP address. True or false?
True. This means they part of the same LAN
A switch considers all the devices as part of the same VLAN. True or false?
True
What does the switch do when it received network traffic?
The switch reads the source MAC address of data coming in a port and puts that MAC address in the MAC address table next to the port number on which it was received.
(Eg. E0: 0260.8c01.1111)
When the switch gets a message in a port and the switch cannot find the destination MAC address in the table, it sends that message out EVERY live port on the switch except the port on which it was received. This is like a hub.
Broadcast messages on a switch are always sent out all live ports except the one on which it was received.
What does a MAC address table hold?
- MAC address
- Port number to match
What happens the switch is populated?
It can move unicast messages data directly from the “ingress” port to the correct destination, or “egress” port.
- This means no collisions can happen on the network
- It also improved bandwidth for every machine
- Improves security as every machine is not receiving all information that any device sends
What happens when a switch receives a broadcast message?
It will send that message to all of its ports except the receiving port.
What is the difference between a hub and a switch that received a broadcast message?
A hub takes a signal in one port and recreate it on every other port on the hub, REGARDLESS of the data. When a switch receives a broadcast message, it will send that broadcast out all ports except receiving port.
Essentially, only when switch receive broadcast message then it will send to all ports but for hub it will recreate and send to all of its ports regardless of the signal it receives.
When a switch is booted up it has a blank MAC address table. True or false
True
What is included in the frame when a machine sends a frame of information?
- Sender’s MAC address
- Destination MAC address
Explain fully what happens when a switch receives a frame of information.
The switch looks up the destination MAC address in its table and find a particular port location.
The switch will then move the data from the sender’s port to the destination’s port based on the MAC address table’s port match.
(Switches can have many MAC addresses mapped to one port)
What is port density?
Number of ports available in a single switch
State type of switch port densities.
- 24-port switch
- 48-port switch
- Modular switch with up to 1000+ ports
What are the considerations to select a switch for a hierarchical network?
- Port density
- Switch Form Factors
State examples of switch form factors
- Fixed configuration switches - features and options are limited to those that originally come with the switch
- Modular configuration switch - The chassis accepts line cards that contain the ports.
- Stackable Configuration switches - Connected by a special cable, effectively operate as one large switch
What are the features of access layer?
- Port security
- VLANs
- Fast ethernet/Gigabit Ethernet
- Power over Ethernet (PoE)
- Link aggregation
- Quality of service
