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- CCNA Routing and Switching 200-105
21.
An engineer plans to connect three switches (SW1, SW2, and SW3) in a lab. Before
connecting the switches, he starts by configuring all three switches as VTP servers,
with matching VTP domain name and password. He then configures some VLANs on
each switch so that switch SW3 has a revision number of 10, switch SW2 has a revision number of 6, and switch SW1 has a revision number of 8. Only then does the
engineer connect the switches with trunks: first SW1 to SW2, then SW2 to SW3, and
then SW3 to SW1. Switch SW1 is elected the STP root switch in VLAN 1. Which
answer most accurately states which VLAN configuration database is used, and why?
- A.All use switch SW1’s database because it has the highest revision number between the fi rst two connected switches.
- B.All use switch SW1’s database because VTP uses the same election logic as STP.
- C.All use SW3’s database because SW3 has the highest revision number.
- D.All use SW2’s database because SW2 has the lowest revision number.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
|
When any two switches connect with a trunk, and both use VTP in either client or
server mode, they exchange VTP messages. Then the switch with the lower revision
number updates its VLAN configuration database to match the VLAN configuration
database with the higher revision number. In this case, with all three switches eventually connecting to each other through some path with trunks, the highest revision
number database will win. The STP election process has nothing to do with the choices made by VTP. |
22.
An engineer compares the output of the show vtp status command on two neighboring switches. One switch, SW1, acts as VTP server, while the other, SW2, acts as
a VTP client. What items in the command output confirm that synchronization has
completed? (Choose two answers.)
- A.Both list the same "last updater" IP address and timestamp
- B.Both list the neighbor's MAC address and the word "synchronized."
- C.SW2 (the client) lists the phrase "synchronized with server."
- D.Both list the same configuration revision number.
- Answer & Explanation
- Report
Answer : [A][D]
Explanation :
Explanation :
|
VTP synchronization causes two neighboring VTP server and/or client switches
to update the switch with the configuration database that has the lower revision number to use the newer database from the neighbor that has the higher revision number.
Once completed, the show vtp status command on both switches will list the same
revision number. Because both use the same configuration database, both will list the
same information about the “last updater,” which is this command’s method of referring to the VTP server that last changed the configuration. The two incorrect answers list text that does not occur in the output of the show vtp status command. |
23.
Switches SW1, SW2, SW3, and SW4 are configured as VTP server, client, transparent,
and off, respectively, all using VTP version 1. A junior engineer has been told to try
to configure the following two commands on each switch directly from the CLI: vlan
200 and vlan 2000. Which answers correctly state which commands will be rejected,
on which switch? (Choose two answers.)
- A.vlan 2000 will be rejected on SW1 (VTP server).
- B.vlan 200 will be rejected on SW2 (VTP client).
- C.vlan 200 will be rejected on SW3 (VTP transparent).
- D.vlan 200 will be rejected on SW1 (VTP server).
- Answer & Explanation
- Report
Answer : [A and B]
Explanation :
Explanation :
|
One correct answer shows a vlan command being issued on a VTP client, which
is not allowed. IOS actually rejects the vlan command when issued on a VTP client. The other correct answer relies on the fact that VTP version 1 (and 2) restricts VTP servers and clients to know of standard range VLANs only (VLANs 1–1005). As a result, the vlan 2000 command on a VTP server (switch SW1) would also be rejected. As for the two incorrect answers, the vlan 200 command would be accepted on a transparent mode switch. On the VTP server, that same vlan 200 command would be accepted, because VLAN ID 200 is inside the range of standard VLAN IDs. |
24.
Two neighboring LAN switches are connected with an operational 802.1Q trunk.
Switch SW1 has been configured with the vtp mode client, vtp domain fred, and vtp
version 2 commands. SW1 has no other VTP configuration commands configured.
Which answer lists a possible reason why switch SW2, on the other end of the trunk,
is not synchronizing its VLAN database with switch SW1? (Choose two answers.)
- A.SW2 has a vtp version 1 command configured.
- B.SW2 has a vtp password G0BeeZ command configured.
- C.SW2 has a vtp domain Fred command configured.
- D.SW2 has a vtp mode client command configured.
- Answer & Explanation
- Report
Answer : [B][C]
Explanation :
Explanation :
|
The VTP domain name must match on two neighboring VTP switches, or they
ignore each other’s messages. The domain name is case sensitive, making the answer
with domain name “Fred” be correct. Additionally, switch SW1 does not have a vtp
password command configured per the question stem. If SW2 were to be configured
per the other correct answer, then SW1 would not have a VTP password, SW2 would,
and the two switches would ignore each other’s VTP messages. (If configured on one
switch, both must have the same case-sensitive password configured.) As for the incorrect answers, the VTP version does not have to match on neighboring switches for them to be able to synchronize. Additionally, two neighboring VTP client mode switches will synchronize, which is what the question asked. Neither could be used to configure new VLANs, but both would synchronize with the other. |
25.
Switches SW1 and SW2 connect through an operational trunk. The engineer wants
to use VTP to communicate VLAN configuration changes. The engineer configures
a new VLAN on SW1, VLAN 44, but SW2 does not learn about the new VLAN.
Which of the following configuration settings on SW1 and SW2 would be a potential
root cause why SW2 does not learn about VLAN 44? (Choose two answers.)
- A.VTP domain names of larry and LARRY, respectively
- B.VTP passwords of bob and BOB, respectively
- C.VTP pruning enabled and disabled, respectively
- D.VTP modes of server and client, respectively
- Answer & Explanation
- Report
Answer : [A, B]
Explanation :
Explanation :
| The case-sensitive domain names must be equal, and the case-sensitive passwords must be equal. The switches must also connect using a trunk before VTP will work. It is normal to have some switches as servers and some as clients. A mismatched pruning configuration setting does not prevent the synchronization of VLAN databases. |
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