4A0-104 Reviews Questions

The dot1Q default SAP (port:*) can be used to pass VLAN tags transparently through a network.

The dot1Q null SAP (port:0) accepts all tagged frames and untagged frames.

The dot1Q default SAP (port:*) accepts all untagged frames and any frames with tag values that are not used as a service-delimiting value on another SAP.

A dot1q null SAP (port:0) and a dot1q default SAP (port:*) cannot both be defined on the same port.

They are used to identify the VRF table for a prefix at the receiving PE.

They are used by VPRNs to control the distribution of VPN routing information.

They are distributed to all PEs and CEs that are part of the VPRN.

They are distributed to PEs to identify the VRF table that a VPN-IPv4 prefix is associated with.

ADSPEC

CSPF

Service ping

LSP trace

It tests uni-directional or round-trip in-band connectivity.

It tests the reachability of hosts that are using an SDP.

It tests the reachability of the far-end IP address of an SDP through its tunnel.

It can be used by specifying only an SDP ID.