Which type of mirroring does SPAN technology perform?

Which type of mirroring does SPAN technology perform?
A . Remote mirroring over Layer 2
B . Remote mirroring over Layer 3
C . Local mirroring over Layer 2
D . Local mirroring over Layer 3

View Answer

Answer: C

Explanation:

You can analyze network traffic passing through ports or VLANs by using SPAN or RSPAN to send a copy of the traffic to another port on the switch or on another switch that has been connected to a network analyzer or other monitoring or security device. Local SPAN supports a SPAN session entirely within one switch; all source ports or source VLANs and destination ports are in the same switch or switch stack.

Each local SPAN session or RSPAN destination session must have a destination port (also called a monitoring port) that receives a copy of traffic from the source ports or VLANs and sends the SPAN packets to the user, usually a network analyzer:

+ If ingress traffic forwarding is enabled for a network security device, the destination port forwards traffic at Layer 2.

Source: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12­2_55_se/ configuration/guide/scg_2960/swspan.html