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- CCNP Switching 642-813
11.
What action should you execute if you wanted to enable VTP pruning on your entire management
domain?
- A.Enable VTP pruning on any client switch in the management domain.
- B.Enable VTP pruning on any switch in the management domain.
- C.Enable VTP pruning on every switch in the management domain.
- D.Enable VTP pruning on a VTP server in the management domain.
- E.E. Disable VTP pruning on a VTP server in the management domain.
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| Enabling VTP pruning on a VTP server allows pruning for the entire management domain. Enabling this on the VTP server will mean that the VTP pruning configuration will be propagated to all VTP client switches within the domain. VTP pruning takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are pruning-eligible. |
12.
Switch R1 is configured with VTP. Which two VTP modes will make R1 capable of creating and
deleting VLANs on itself? (Select two)
- A.Client
- B.Server
- C.Transparent
- D.Pass-through
- E.No-negotiate
- Answer & Explanation
- Report
Answer : [B, C]
Explanation :
Explanation :
|
VTP Modes You can configure a switch to operate in any one of these VTP modes: Server-In VTP server mode, you can create, modify, and delete VLANs and specify other configuration parameters (such as VTP version) for the entire VTP domain. VTP servers advertise their VLAN configuration to other switches in the same VTP domain and synchronize their VLAN configuration with other switches based on advertisements received over trunk links. VTP server is the default mode. Client-VTP clients behave the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. Transparent-VTP transparent switches do not participate in VTP. A VTP transparent switch does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, in VTP version 2, transparent switches do forward VTP advertisements that they receive out their trunk interfaces. If you configure the switch as VTP transparent, you can create and modify VLANs but the changes affect only the individual switch. |
13.
When the Catalyst switch R1 is enabled to use VTP, which information does it advertise on its
trunk ports? (Select two)
- A.VTP mode
- B.STP root status.
- C.Negotiation status.
- D.Management domain.
- E.Configuration revision number.
- Answer & Explanation
- Report
Answer : [D, E]
Explanation :
Explanation :
| The VTP protocol maintains VLAN configuration consistency throughout the network by distributing VLAN information to the network. VLAN information is sent to network devices in advertisements that contain the VTP management domain name, the current configuration revision number, the VLANs that the server knows about , and certain VLAN parameters. Any time you change a VLAN, VTP automatically sends an advertisement to update all other network devices. The following global configuration information is distributed in VTP advertisements: VLAN IDs (ISL and 802.1Q) Emulated LAN names (for ATM LANE ) 802.10 SAID values (FDDI) VTP domain name VTP configuration revision number VLAN configuration, including maximum transmission unit (MTU) size for each VLAN Frame format. |
14.
Two Company switches are connected via a trunk link. In this network, the original frame is
encapsulated and an additional header is added before the frame is carried over a trunk link. At
the receiving end, the header is removed and the frame is forwarded to the assigned VLAN. This
describes which technology?
- A.DISL
- B.ISL.
- C.DTP
- D.IEEE 802.1Q.
- E.MPLS
- F.None of the other alternatives apply
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
|
Inter-Switch Link Protocol The Inter-Switch Link (ISL) protocol is a Cisco proprietary method for preserving the source VLAN identification of frames passing over a trunk link. ISL performs frame identification in Layer 2 by encapsulating each frame between a header and trailer. Any Cisco switch or router device configured for ISL can process and understand the ISL VLAN information. ISL is primarily used for Ethernet media, although Cisco has included provisions to carry Token Ring, FDDI, and ATM frames over Ethernet ISL. (A Frame-Type field in the ISL header indicates the source frame type.) When a frame is destined out a trunk link to another switch or router, ISL adds a 26-byte header and a 4-byte trailer to the frame. The source VLAN is identified with a 10-bit VLAN ID field in the header. The trailer contains a cyclic redundancy check (CRC) value to ensure the data integrity of the new encapsulated frame. Figure 6-3 shows how Ethernet frames are encapsulated and forwarded out a trunk link. Because tagging information is added at the beginning and end of each frame, ISL is sometimes referred to as double tagging . |
15.
The Company core switches use 802.1Q trunks to connect to each other. How does 802.1Q
trunking keep track of multiple VLANs?
- A.It tags the data frame with VLAN information and recalculates the CRC value
- B.It encapsulates the data frame with a new header and frame check sequence
- C.It modifies the port index of a data frame to indicate the VLAN.
- D.It adds a new header containing the VLAN ID to the data frame.
- E.None of the other alternatives apply.
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
|
The IEEE 802.1Q protocol can also carry VLAN associations over trunk links. However, this frame
identification method is standardized, allowing VLAN trunks to exist and operate between
equipment from multiple vendors. In particular, the IEEE 802.1Q standard defines an architecture for VLAN use, services provided with VLANs, and protocols and algorithms used to provide VLAN services. Like Cisco ISL, IEEE 802.1Q can be used for VLAN identification with Ethernet trunks. Instead of encapsulating each frame with a VLAN ID header and trailer, 802.1Q embeds its tagging information within the Layer 2 frame. This method is referred to as single-tagging or internal tagging. 802.1Q also introduces the concept of a native VLAN on a trunk. Frames belonging to this VLAN are not encapsulated with any tagging information. In the event that an end station is connected to an 802.1Q trunk link, the end station can receive and understand only the native VLAN frames. This provides a simple way to offer full trunk encapsulation to the devices that can understand it, while giving normal access stations some inherent connectivity over the trunk. |
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