Ccnp Switch 642-813: Rstp

Front 1

What is RPVST+?

Back 1

Rapid Per VLAN Spanning Tree Plus

Front 2

What command configures a switch to use RPVST+?

Back 2

spanning-tree mode rapid-pvst

Front 3

What are the four RSTP Port Roles?

Back 3

Root
Designated
Alternate
Backup

Front 4

Describe the RSTP root port.

Back 4

One port on a switch that has the lowest root path cost to the root.

Front 5

Describe the RSTP designated port.

Back 5

Port on a LAN segment that has the best root path cost.

Front 6

Describe the RSTP alternate port.

Back 6

A port with an alternate path to the root bridge.

Front 7

Describe the RSTP backup port.

Back 7

A port that provides a redundant connection to a segment where another port is already designated.

Front 8

What are the three RSTP Port States?

Back 8

Discarding
Learning
Forwarding

Front 9

Describe the RSTP Forwarding state?

Back 9

Incoming frames forwarded; MACs learned

Front 10

Describe the RSTP Learning state?

Back 10

Drops incoming frames
MACs learned

Front 11

Describe the RSTP Discarding state?

Back 11

Incoming frames are dropped
No MACs learned

Front 12

How do RSTP switch handle BPDUs from 802.1D?

Back 12

Switch port will operate using the BPDU it received (protocols can coexist) and will revert to 802.1D rules for that port.

Front 13

What are the three RSTP Port Types?

Back 13

Edge Port
Root Port
Point-to-point Port

Front 14

What is an RSTP Edge port?

Back 14

A port that connects to a single host and cannot form a loop.

Front 15

What is an RSTP Root port?

Back 15

Has the best cost to the root.

Front 16

What is an RSTP Point-to-point port?

Back 16

A port connected to another switch and becomes a designated port.

Front 17

What will cause an RSTP Edge port to lose its status?

Back 17

Receiving a BPDU

Front 18

What determines if a port will be point-to-point?

Back 18

Duplex of the link: Full duplex is point-to-point.

Front 19

How does RSTP convergence differ from 802.1D?

Back 19

Switches use BPDUs to negotiate, not timers.

Front 20

What event will cause an RSTP topology change BPDU notification (TC BPDU) to be sent?

Back 20

A non-edge port transitioning to the Forwarding state.

Front 21

How do you configure a port as an Edge port?

Back 21

With the "spanning-tree portfast" command.

Front 22

Describe RSTP synchronization.

Back 22

RSTP convergence is achieved when all switches decide on the state of their ports.
A “wave effect” in the network of BPDU handshakes as switches become synchronized.

Front 23

What BPDU version does RSTP use?

Back 23

2

Front 24

What three 802.1D STP states does RSTP Discarding combine?

Back 24

Disabled
Blocking
Listening

Front 25

Is RSTP compatible with legacy STP?

Back 25

Yes