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Category: 642-382

Exam 642-382: CXFF – Cisco Express Foundation for Field Engineers

which step should the customer take to fix the situation?

A North American customer is using 2.4-GHz radios in a point-to-point configuration. The radio power level is 17 dBm and is transmitting at 11 Mbps. The customer is using 21.5-dBi dish antennas and 50 feet of cabling, with a loss of 8.4 dB per 100 feet. The customer increased the distance between the transmitter stations and began experiencing link problems.

Without using a professional installer, which step should the customer take to fix the situation?

What does PVST+ do to correct this?

Refer to the exhibit. Switches A and C are running PVST+ STP, and Switch B is running 802.1Q STP. If the BPDU of the root in VLAN 1 is better than the BPDU of the root in VLAN 2, then there is no blocking port in the VLAN 2 topology. The BPDU of VLAN 2 never makes a “full circle” around the topology; it is replaced by the VLAN 1 BPDU on the B-C link, because B runs only one STP merged with VLAN 1 STP of PVST+. Thus, there is a forwarding loop.

What does PVST+ do to correct this?

which step should the customer take to fix the situation?

A North American customer is using 2.4-GHz radios in a point-to-point configuration. The radio power level is 17 dBm and is transmitting at 11 Mbps. The customer is using 21.5-dBi dish antennas and 50 feet of cabling, with a loss of 8.4 dB per 100 feet. The customer increased the distance between the transmitter stations and began experiencing link problems.

Without using a professional installer, which step should the customer take to fix the situation?

What does PVST+ do to correct this?

Refer to the exhibit. Switches A and C are running PVST+ STP, and Switch B is running 802.1Q STP. If the BPDU of the root in VLAN 1 is better than the BPDU of the root in VLAN 2, then there is no blocking port in the VLAN 2 topology. The BPDU of VLAN 2 never makes a “full circle” around the topology; it is replaced by the VLAN 1 BPDU on the B-C link, because B runs only one STP merged with VLAN 1 STP of PVST+. Thus, there is a forwarding loop.

What does PVST+ do to correct this?


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