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NEW QUESTION # 162
On an STP network, the root bridge, root port, and designated port are elected in sequence. The election rules of these ports are different. List the steps for electing the root port in sequence.
Answer:
Explanation:
Explanation:
The sequence of steps for electing the root port in an STP (Spanning Tree Protocol) network is as follows:
Bridge ID Comparison: TheBridge ID(BID) is compared between the bridges in the network. A smaller value indicates a higher priority, meaning the bridge with the lowest Bridge ID is elected as the root bridge.
RPC (Root Path Cost) Comparison: The path cost to reach the root bridge is calculated. The router with the lowest Root Path Cost (RPC) to the root bridge will have a higher priority for the election of the root port.
Peer BID Comparison: If there is a tie in the Root Path Cost, thePeer BIDis compared. A smaller Peer BID indicates a higher priority. This step ensures that if two routers have the same RPC, the one with the lower Peer Bridge ID wins.
Local BID Comparison: If there is still a tie, theLocal BIDis compared. A smaller Local BID indicates a higher priority. This final step ensures that the router with the lowest local identifier is selected.
Bridge ID Comparison:The first step in electing the root port is comparing the Bridge IDs. The bridge with the lowestBridge IDbecomes theroot bridge. The Bridge ID is made up of thebridge priorityandMAC address.
The root bridge is the center of the network for STP, and all other ports will calculate their paths based on this root.
HCIP-Datacom-Core Technology Training Material (STP Concepts and Election Process).
RPC (Root Path Cost) Comparison:Once the root bridge is selected, the network needs to determine the best path to the root. Each port on a non-root bridge will calculate theRoot Path Cost (RPC), which is the cumulative cost of reaching the root bridge from that port. The root port is the one that has the lowest RPC, meaning it provides the best path to the root bridge.
Reference:HCIP-Datacom-Core Technology Training Material (STP Path Selection).
Peer BID Comparison:If multiple paths have the sameRoot Path Cost, the next step is to compare thePeer Bridge IDs. The bridge with thelowest Peer BIDis chosen as the root port. This ensures a tie-breaking mechanism based on the neighbor's identifier.
Reference:HCIP-Datacom-Core Technology Training Material (STP Election Process).
Local BID Comparison:If there is still a tie after comparing thePeer Bridge IDs, theLocal Bridge IDis compared. A smallerLocal BIDindicates a higher priority, and the port with the lower Local BID will be selected as the root port.
Reference:HCIP-Datacom-Core Technology Training Material (STP Local Port Selection).
NEW QUESTION # 163
Which descriptions about IGMP Snooping are correct? (Multiple choice)
Answer: A,B
NEW QUESTION # 164
See the following figure. All routers on the network run IS-IS and are in area 49.0001. By referring to the LSDB of R1, the Level-2 DIS is. (Enter the device name, for example, R1.)
Answer:
Explanation:
R3
* Understanding the LSDB and Level-2 DIS Election in IS-IS:
* In IS-IS, the Designated Intermediate System (DIS) is elected for both Level-1 and Level-2 on broadcast networks to manage the link-state database (LSDB) and reduce the number of LSAs exchanged.
* The election of the DIS is based on the highest priority. If the priority is the same, the router with the highest System ID becomes the DIS.
NEW QUESTION # 165
After the stack is split, the party that loses the MAD election will be in the __.
Answer:
Explanation:
Recovery
NEW QUESTION # 166
A switch running a later IGMP version can identify Report messages of an earlier IGMP version, but the switch running an earlier IGMP version cannot identify Report messages of a later IGMP version. To ensure that IGMP runs properly, you are advised to set the IGMP version on the switch to be the same as or later than the IGMP version of member hosts.
Answer: A
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. Understanding IGMP Version Compatibility:
* IGMP (Internet Group Management Protocol) supports multiple versions, such as IGMPv1, IGMPv2, and IGMPv3.
* A device running a later version of IGMP is backward-compatible and can identify Report messages from earlier versions.
* However, a device running an earlier version of IGMP cannot recognize the newer features or formats of later IGMP versions.
2. Best Practice:
To avoid compatibility issues, the IGMP version configured on the switch should be the same as or later than the version used by the member hosts in the network.
3. Why the Statement is TRUE:
The statement is correct because it describes the compatibility behavior of IGMP versions and advises setting the switch IGMP version appropriately.
NEW QUESTION # 167
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