You are on page 1of 14

Question

This task requires you to use the CLI of Sw-AC3 to answer five multiple-choice
questions. This does not require any configuration.
To answer the multiple-choice questions, click on the numbered boxes in the right
panel.

There are five multiple-choice questions with this task. Be sure to answer all five
questions before leaving this item.

Notice: All the images in this VTP LAB are used for demonstration only, you will
see slightly different images in the real CCNA exam
Question 1:
What interface did Sw-AC3 associate with source MAC address 0010.5a0c.ffba ?
a) Fa0/1
b) Fa0/3

c) Fa0/6 d) Fa0/8 e) Fa0/9 f) Fa0/12 Answer: Fa 0/8 Explanation: to find out which interface associated with a given MAC address.5a0c.ffba is associated with interface Fa0/8 Question 2: What ports on Sw-AC3 are operating has trunks (choose three)? a) Fa0/1 b) Fa0/3 . you will see a MAC address table like this: From this table we can figure out that the MAC address 0010. use the show mac-address-table command. It shows the learned MAC addresses and their associated interfaces. After entering this command.

its mode.c) Fa0/4 d) Fa0/6 e) Fa0/9 f) Fa0/12 Answer: Fa0/3. The image below shows how it works: (This image is used for demonstration only) Question 3: What kind of router is VLAN-R1? a) 1720 b) 1841 c) 2611 d) 2620 Answer: 2620 . encapsulation and whether it is trunking. Fa0/9 and Fa0/12 Explanation: Use the show interface trunk command to determine the trunking status of a link and VLAN status. This command lists port.

Port ID: The interface of the remote neighbor you receive CDP information 6. Local Interface : The interface to which this neighbor is heard 3. Platform: Which type of device the neighbor is 5. Holdtime: Decremental hold time in seconds Sample output of show cdp neighbors command: One thing I want to notice you is "Local Intrfce" in the image above refers to the local interface on the device you are running the "show cdp neighbors" command Question 4: Which switch is the root bridge for VLAN 1? Answer: Sw-DS1 Explanation: First we use the show spanning-tree vlan 1 to view the spanningtree information of VLAN 1 . 4.Explanation: VLAN-R1 is the router directly connected to Sw-Ac3 switch. so we can use the show cdp neighbors command to see: 1.R for router. Capability: Capability of this neighboring device . 2. H for Host etc. S for switch. Neighbor Device ID : The name of the neighbor device.

In this case. In this case. You can verify it with the show cdp neighbors command: The "Local Intrfce" column refers to the interface on the switch running "show cdp neighbors" command.From the "Cost 19". Sw-DS1 is associated with interface FastEthernet0/12 -> Sw-DS1 is the root bridge . so we have to figure out which switch is associated with this port -> it is the root bridge. we notice that the root port on Sw-Ac3 switch is FastEthernet0/12. we learn that the root switch is directly connected to the SwAc3 switch over a 100Mbps Ethernet link Notice that if you see all of the interface roles are Desg (designated) then you can confirm Sw-Ac3 switch is the root bridge for this VLAN (VLAN 1). If you see there is at least one Root port in the interface roles then you can confirm Sw-Ac3 is not the root bridge because root bridge does not have root port.

44 with IP address 192.254/24 Therefore the default gateway of the host should be 192.168.168.168.Question 5: What address should be configured as the default-gateway for the host connected to interface fa 0/4 of SW-Ac3? Answer: 192.254 Explanation: First we have to identify which VLAN interface Fa0/4 belongs to by the show vlan command From the exhibit we know that VLAN 44 is configured on router using subinterface Fa0/0.44.254 Question 6: From which switch did Sw-Ac3 receive VLAN information ? .44.44.

Answer: Sw-AC2 Explanation: to view the VTP configuration information. Finally we use the show cdp neighbors detail to find out who 163. It will be reconnected to the Fa 0/16 port of Sw-Ac3.3 (notice:the IP address may be different).3 is: Question 7: Refer to the exibit.5.8. use the show vtp status command So we knew Sw-Ac3 received VLAN information from 163. SwX was taken out of the production network for maintenance. What happens to the network when it is reconnected and a trunk exists between the two switches? .8.5.

All existing switches will have the students. Management. Servers.All VLANs except the default VLAN win be removed from all switches B . and no-where VLANs C . Production and no-where will be removed from existing switches Answer and Explanation: First we should view the VTP configuration of switch Sw-Ac3 by using the show vtp status command on Sw-Ac3 Notice that its configuration revision number is 5 and VTP Domain Name is home-office . admin.A .The VLANs Servers. Management. Production. faculty.The VLANs Servers. Management. Production and no-where will replace the VLANs on SwX D .

and both of them have same VTP Domain Name called "home-office". We should check vlan information of Sw-Ac3 switch with show vlan command So the correct answer is D . which switch has a higher revision number it will become the updater and other switches will overwrite their current databases with the new information received from the updater (provided that they are on the same domain and that switch is not in transparent mode). .The VLANs Servers.In particular. which is greater than that of Sw-Ac3 switch. Production and no-where will be removed from existing switches Please notice that in the real CCNA exam you may see a different configuration revision of Sw-Ac3 or of SwX. In general. Therefore SwX will replace vlan information on other switches with its own information.Next. Management. from the exhibit we know that SwX has a revision number of 6.

e612? (Choose three) A . some recent comments have said that the new switch's VTP Operating Mode is Server but the answer is still the same.8a47.Fa0/1 D . Management. Also.Fa0/12 Answer: B C D Explanation: First we check to see which ports the source mac-address and the destination mac-address belong to by using show mac-address-table command .The VLANs Servers.fd86 and destination mac-address 000a.if the revision number of SwX is lower than that of Sw-Ac3. the answer should be "C .Fa0/8 B . Production and no-where will replace the VLANs on SwX". Question 8: Out of which ports will a frame be forwarded that has source mac-address 0010.5a0c.Fa0/3 C .

In this case.8a47. Fa0/3 and Fa0/12. it means that there can be other ports besides Fa0/1.We notice that the source mac-address 0010. we can figure out it will flood this frame to Fa0/1. Please notice that the "show mac-address-table" command just lists information that was learned by the switch. except the port it received this frame (port Fa0/6). Fa0/3 and Fa0/12 belong to Vlan 33.fd86 is listed in the table and it belongs to Vlan 33 but we can't find the destination mac-address 000a.e612 in this table. You can use the show vlan command to see which ports belong to vlan 33 . the switch will flood to all ports of Vlan 33 and flood to all the trunk links. Therefore from the output above.5a0c.

Fa0/5 and Fa0/7. In fact.2. Our switch will flood the frame to these ports. too. it will forward the packet to its default gateway.0. the VLAN-R1 router.5 (or any ip that is not on the same subnet) what will be the destination MAC address? Answer and Explanation: Because the destination address is not on the same subnet with the switch. they are Fa0/2.And we found other ports which belong to vlan 33.1. So we have to find out who is the default gateway of this switch by using the show running-config command From the output. we can easily guess that its default gateway should be a layer 3 device like a router. and in this case. use the show cdp neighbor detail command and focus on the description of VLAN-R1 router . And we can check which trunk ports will receive this frame by the show interface trunk command -> Port Fa0/9 will also receive this frame! Question 9: If one of the host connected to Sw-AC3 wants to send something for the ip 190. To verify our theory. we notice that its default-gateway is 192.168.254.

And "the interface: FastEthernet0/3" tells us that the switch is connected to VLAN-R1 router through Fa0/3 port (Fa0/3 is the port on the switch).From this output.254).168. we can confirm the switch's default gateway is VLAN-R1 router (with the IP address of 192. Finally we just need to use the show mac-address-table command to find out which MAC address is associated with this interface .1.

8360.b7e9. Although there are some entries of port Fa0/3 with different Vlans but they have the same MAC address .(Notice that in the real CCNA exam the MAC address or port may be different) And we find out the corresponding MAC address is 000a.