Flashcards in STP Deck (21)
What are the basic functions of switch?
What is STP?
Spanning Tree Protocol
Where does a Layer 2 loop occur?
When there a fault tolerant (parallel) links between switches
What does STP do?
Identifies parallel paths within a network and blocks one or more ports
What is the ROOT in STP?
The administrative Switch/Bridge
How does STP work?
ROOT Switch forwards on all ports BPDUs, servant devices than receive more than one BDPU will block a parallel port
What standards are associated with STP?
802.1d - STP
802.1w - Rapid STP
When would a switch block?
STP to prevent L2 loop
When would a switch flood?
When it has no entry for the L2 destination address
When would a switch filter?
When it knows the L2 source and destination address and will send it just that address on a VLAN
When would a switch forward?
When not in a blocking state
What is BPDU?
Bridge Protocol Data Unit
What would you use to manage a switch remotely?
VLAN Interface (L3)
What would you use to directly manage a switch?
What is a VTY (Virtual Terminal)?
Used when remotely connecting to a switch or router
What is a AAA Server?
Authentication, Authorisation and Accounting
Central management repository for logging into switches or routers
What protocols are used to communicate with a AAA server?
RADIUS - Open Source
TACACS+ - Cisco Proprietary
What is in-band and out-of-band management?
Switch management traffic is on same network as users
Out-of-band segregates the data into a VLAN and a different subnet
What purpose does an ACL serve on a router's interface?
Access Control List can specify what information is allowed to be routed between VLANs
What is SPB?
Shortest Path Bridging
Eradicates STP and utilises all bandwidth