Switching Flashcards
Unicast
1 to 1 communication
Broadcast
1 to ALL communication
Multicast
1 to Many - Multicast clients must be part of logical group
Broadcast address will never be a
Source IP Address
Multicast address will never be a
Source IP address
auto-MDIX
feature is enabled by default on select IOS
Collision Domains
each port on a switch and router is a single collision domain
Broadcast Domain
Each port on a router is a Broadcast
Domain
Segmentation
term used to describe how a router breaks up broadcast domains
Store-and-forward
when switch recieves the fram it stores the data in buffers until the complete frame has
Cut-through
two variants: Fast-forward, Fragment-free
fast-forward switching
variant of cut through - immediately forwards a packet after reading the destination address.
fragment-free switching
variant of cut through - stores the first 634 bytes of the frame before forwarding
symmetric switching
all ports have same bandwidth
asymmetric switching
switching ports do not have the same bandwidth on all ports. Memory buffering is required
port-based memory
buffering
shared memory buffering
deposits all frames into a common memory buffer
switch boot sequence
- low level CPU initialization
- POST
- Initializes
- loads default operating system
stat light is amber - what happened
failed post
default management vlan
VLAN1 - only used for remote administration
how to configure a switch management interface
- set up vlan
- configure an access port to vlan
- configure default gateway
PortFAST
when enabledthe interface changes from a blocking state to a forwarding state w/o making the intermediate STP Changes.
When to use PortFAST
only on interfaces that connect to end stations; otherwise could cause loop
BPDU
bridge protocol data unit - the BPDU guard feature on Portfast enabled interfaces - prevents the switch interface from sending and recieving BPDU’s
“bpdufilter default”
globally enable BPDU filtering on PortFAST enabled interface
“bpduguard default”
place the interfaces that recieve BPDU
Portfast
“Default”
globally enables PortFAST on all non trunking ports
BackboneFast
*
UplinkFast
*
Root Guard
*
MAC Address Table (CAM table)
*
microsegmentation
term used to describe how a switch the switch decreases the number of collisions on the network
switch packet forwarding methods
- store and forward
2. cut through
2 variants of cut through
- fast forward switching
2. fragment free switching
