Cisco CCNA mock exam questions sample test – Question 70

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You are the Cisco administrator for NationalAct Incorporated. One of your assistants is preparing to introduce a new switch to the network. Before doing so, you execute the show vtp
status command on OldSwitch and NewSwitch, respectively, and receive the following output:
If NewSwitch is introduced to the network, which of the following will be true?

A. NewSwitch will delete its current VTP data.
B. There will be 10 VLANs in the network.
C. OldSwitch will retain its current VTP data.
D. There will be 24 VLANs in the network.

Correct Answer: B

Explanation:
If NewSwitch is introduced to the network, there will be 10 VLANs. The VLAN database of the new switch will overwrite the VLAN databases of the production switches because it is
operating in server mode and has a higher VLAN configuration revision number.
VLAN Trunking Protocol (VTP) is used to synchronize VLANs between different switches. The VTP configuration revision number is used to determine which VTP switch has the most
current version of the VLAN database, and is incremented whenever a VLAN change is made on a VTP server switch. The Configuration Revision: 125 output indicates that
NewSwitch has a configuration revision number of 125, which will be compared to other switches in the same VTP domain, including OldSwitch, which has a revision number of 62. If
the production switches have lower configuration revision numbers than the new switch, their VLAN databases will be replaced with the VLAN database of the new switch. Any switch
ports that had been assigned to be removed from VLANs in the configuration database of the new switch will be disabled, possibly resulting in catastrophic network failure. All VTP
switches in the same VTP domain should have a domain password defined, which will protect against a rogue switch being added to the network and causing VLAN database
corruption.
NewSwitch will not delete its current VTP data. If the production switches have lower configuration revision numbers than the new switch, their VLAN databases will be replaced with
the VLAN database of the new switch.
The number of VLANs will not remain 24. The 24 VLANs indicated by the Number of existing VLANs: 24 output will be overwritten with the 10 VLANs in the NewSwitch VLAN
database.
OldSwitch will not retain its current VTP data. It will be replaced with the VLAN database of the new switch.
Objective:
LAN Switching Fundamentals
Sub-Objective:
Configure, verify, and troubleshoot VLANs (normal/extended range) spanning multiple switches
References:
Cisco > Support > LAN Switching > Virtual LANS / VLAN Trunking Protocol (VLANS/VTP) > Configure > Configuration Examples and Technotes > Configuring VLAN Trunk Protocol
(VTP) > Document ID: 98154
Cisco > Catalyst 4500 Series Switch Cisco IOS Software Configuration Guide, 12.2(25) > Understanding and Configuring VLANs, VTP, and VMPS
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 1: Virtual LAN Concepts, pp. 16-20.
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 1: Virtual LAN Concepts, pp. 38-42.