Review Questions

1.	Which of the following is a true statement regarding VLANs? You must have at least two VLANs defined in every Cisco switched network. All VLANs are configured at the access layer and extend to the distribution layer. VLANs should extend past the distribution switch on to the core. VLANs should not extend past the distribution switch on to the core.
2.	If you want to configure ports 3/1–12 to be part of VLAN 3, which command is valid on a set- based switch? console> (enable) set vlan 3 2/1, 2/2, 2/3, etc. console> (config) vlan 3 set port 3/1-12 console> (enable) set vlan 3 3/1-12 console> set vlan 3 3/1-12 console> vlan membership 3 3/1-12
3.	What are the two ways that an administrator can configure VLAN memberships? (Choose all that apply.) DHCP server Static Dynamic VTP database
4.	How are local VLANs configured? By geographic location By function By application Doesn’t matter
5.	If you want to verify the VTP-configured information on an IOS-based switch, which of the following commands would you use? sh vtp status sh domain set vtp domain output sho vtp info
6.	What size frames are possible with ISL and 802.1Q frames? (Choose all that apply.) 1548 bytes 1522 bytes 4202 bytes 8190 bytes
7.	Which of the following is true regarding the Canonical Format Indicator (CFI)? (Choose all that apply.) It is a 1-bit field that is always a 0 if running an 802.3 frame. The CFI field was originally designed to be used for Token Ring VLANs, but it was never implemented except for some proprietary Token Ring LANs. It is not used on any switch but the 4000 series. It is used with FDDI trunk ports only.
8.	Regarding 802.1Q, what is the TPID EtherType field always set to? 17 6 0x81-00 0x2102
9.	How are dynamic VLANs configured? Statically By an administrator By using a DHCP server By using VLAN Management Policy Server
10.	If you want to completely clear all configurations on an IOS-based switch, what two commands must you type in? clear config, reload delete nvram, restart delete vtp, delete nvram erase start, reload
11.	What do VTP switches advertise on their trunk ports? (Choose all that apply.) Management domain name Configuration revision number VLAN identifiers configured on Cisco routers VLANs the switch knows about Parameters for each VLAN CDP information
12.	Which of the following is true regarding VTP? VTP pruning is enabled by default on all switches. VTP pruning is disabled by default on all switches. You can run VTP pruning only on 4000 or higher switches. VTP pruning is configured on all switches by default if it is configured on just one switch.
13.	Which of the following Cisco standards encapsulates a frame and even adds a new FCS field? ISL 802.1Q 802.3z 802.3u
14.	What does setting the VTP mode to transparent accomplish? Transparent mode will only forward messages and advertisements, not add them to their own database. Transparent mode will forward messages and advertisements and add them to their own database. Transparent mode will not forward messages and advertisements. Transparent mode makes a switch dynamically secure.
15.	Which of the following IEEE standards actually inserts a field into a frame to identify VLANs on a trunk link? ISL 802.3z 802.1Q 802.3u
16.	How long a VTP domain name can there be on a 4000 series switch? The VTP name can be up to 23 characters. The VTP name can be up to 32 characters. The VTP name can be up to 48 characters. The VTP name can be up to 80 characters.
17.	If you want to view the trunk status on port 24 of an IOS-based switch, which command would you use? show switchport fa0/24 show trunk interface fa0/24 show trunk switchport fa0/24 show trunk fa/24 show interface fa0/24 switchport
18.	VTP provides which of the following benefits to a switched network? (Choose all that apply.) Multiple broadcast domains in VLAN 1 Management of all switches and routers in an internetwork Consistent configuration of VLANs across all switches in the network Allowing VLANs to be trunked over mixed networks—for example, Ethernet to ATM LANE or FDDI Tracking and monitoring of VLANs accurately Dynamic reporting of added VLANs to all switches Plug-and-play VLAN adding Plug-and-play configuration
19.	Which of the following is true regarding VTP? Changing the VTP version on one switch changes all switches in a domain. If you change the VTP version on one switch, you must change the version on all switches. VTP is on by default with a domain name of Cisco on all Cisco switches. All switches are VTP clients by default.
20.	Which of the following is true regarding trunk links? They are configured by default on all switch ports. They work only with a type of Ethernet network and not with Token Ring, FDDI, or ATM. You can set trunk links on any 10Mbps, 100Mbps, and 1000Mbps ports. You must clear the unwanted VLANs by hand.

Answers

1.	D VLANs should not pass through the distribution layer. The distribution layer devices should route between VLANs.
2.	C The set-based switches can configure multiple ports to be part of a VLAN at the same time. The command is set vlan vlan# slot/ports.
3.	B, C Static VLANs are set port by port on each interface or port. Dynamic VLANs can be assigned to devices via a server.
4.	A Local VLANs are created by location—for example, an access closet.
5.	A The command show vtp status provides the switch’s VTP mode and the domain name.
6.	A, B ISL encapsulates frames with another frame encapsulation type. This means that a data frame can extend past the regular frame size of 1518 bytes up to 1548 bytes, whereas 802.1Q frames can be up to 1522 bytes.
7.	A, B The CFI field is not used often, and only in proprietary Token Ring LANs. It will always be a 0 unless a programmer specifically programs it to be different.
8.	C The EtherType file is always a 0x81-00 when 802.1Q frame tagging is used.
9.	D A VLAN Management Policy Server (VMPS) must be configured with the hardware addresses of all devices on your internetwork. Then the server is allowed to hand out VLAN assignments configured by the administrator into the VMPS database.
10.	D Just as with routers, the command erase startup-config clears out the nvram files, and the reload command forces the switch to cycle and implement the startup-config, which is now empty.
11.	A, B, D, E VLAN Trunk Protocol is used to update switches within a domain with information about configured VLANs. This includes the management domain name and configuration revision number so that receiving switches know if new VLAN information (including configured parameters) has been added to the VTP database and all the VLANs the switch knows about.
12.	B VTP pruning stops VLAN information from traversing a trunk link if it would be discarded on the remote end because no VLANs are configured on the switch.
13.	A Inter-Switch Link (ISL) encapsulates a new header and trailer to an existing data frame.
14.	A VTP transparent switches do not update their VTP database with VLAN information received on trunk links. However, they will forward these updates.
15.	C 802.1Q does not encapsulate a data frame as ISL does. Instead, it puts a new field into the existing frame to identify the VLAN that the packet belongs to.
16.	B VTP domain names can be up to 32 characters and must be the same on all switches with which you want to share VLAN information.
17.	E The IOS-based switches use the show interface interface_number switchport to display trunk status.
18.	B, C, D, E, F, G, H VTP does not have anything to do with breaking up or configuring broadcast domains. All answers except A are correct.
19.	A If you change the VTP version on one switch, all other switches are changed automatically if they support the new version.
20.	D Trunk links, by default, are assigned to forward all VLANs. You must delete these by hand if you don’t want all VLANs to be sent down a trunk link.