Assesment Test 100-100

Front 1

1. What is the sys-id-ext field in a BPDU used for?

A. It is a 4-bit field inserted into an Ethernet frame to define trunking informationbetween switches.

B. It is a 12-bit field inserted into an Ethernet frame to define VLANs in an STPinstance.

C. It is a 4-bit field inserted into an non-Ethernet frame to define EtherChanneloptions.

D. It is a 12-bit field inserted into an Ethernet frame to define STP root bridges.

Back 1

1. B. To allow for the PVST+ to operate, there’s a field inserted into the BPDU to accommodatethe extended system ID so that PVST+ can have a root bridge configured on aper-STP instance. The extended system ID (VLAN ID) is a 12-bit field, and we can evensee what this field is carrying via show spanning-tree command output. See Chapter 15for more information.

Front 2

test 2

Back 2

test answer 2

Front 3

test 3

Back 3

test answer3

Front 4

test 4

Back 4

test answer 4