Free HCIP-Datacom-Core Technology V1.0 Practice Questions

Question # 81

IGMP group entries play an important role in multicast forwarding. An administrator runs a command to view information about a multicast entry. The information is as follows:

sql

Copy

< HUAWEI > display igmp group

Interface group report information

Vlanif100(10.1.6.2):

Total 1 IGMP Group reported

Group Address Last Reporter Uptime Expires

225.1.1.2 10.1.6.10 00:02:04 00:01:17

Given this, which of the following statements are true?

Options:

This entry can be used to construct the corresponding (S, G) entry.

This entry is created when the device receives an IGMP Join message from a user.

Expires indicates the aging time of the IGMP group.

225.1.1.2 is the address of the group that the user joins.

Discussion 0

Question # 82

OSPF routers exchange Hello packets to establish neighbor relationships. The Hello packet sending modes vary by network type. On which of the following types of networks are Hello packets multicast?

Options:

NBMA

P2MP

P2P

Broadcast

Discussion 0

Question # 83

To prevent loops on an STP network, after a designated port is elected, it must wait for a long time and can forward packets only after the status of all ports on the entire network is determined. To solve this problem, RSTP uses the P/A mechanism to speed up the downstream port's transition to the Forwarding state.

Options:

TRUE

FALSE

Discussion 0

Question # 84

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.

Question # 84

Options:

Discussion 0

Answer:

Explanation:

The sequence of steps for electing the root port in an STP (Spanning Tree Protocol) network is as follows:

Bridge ID Comparison: The Bridge 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, the Peer BID is 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, the Local BID is 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 lowest Bridge ID becomes the root bridge. The Bridge ID is made up of the bridge priority and MAC 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 the Root 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 same Root Path Cost, the next step is to compare the Peer Bridge IDs. The bridge with the lowest Peer BID is 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 the Peer Bridge IDs, the Local Bridge ID is compared. A smaller Local BID indicates 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)., , , ]

Question # 85

The main objective of security policies is to reduce the intrusion success rate and detect attackers. To ensure that detection and prevention are performed throughout the attack lifecycle, a series of plans need to be made. Which of the following statements is false about security policy planning?

Options:

If possible, do not reference the content security profile in all security policy rules whose action is permit, so as to facilitate quick check.

Files with unknown threats can be sent to the sandbox for inspection. The firewall periodically reads the inspection result from the sandbox and blocks subsequent traffic based on the inspection result.

To further reduce the attack surface, enable URL filtering and file blocking on the basis of the security policy that permits an application, so as to prevent users from accessing high-risk websites and downloading high-risk files.

Before setting security policies, the administrator must fully understand the applications, users, and contents on the network. This is necessary for properly setting security policies so that the firewall can check the corresponding user traffic.

Discussion 0

Question # 86

In addition to a route reflector, the confederation is another method that reduces the number of IBGP connections in an AS.

Which of the following statements are true about the confederation technology? (Choose all that apply)

Options:

This technology is applicable to large-scale networks.

Special EBGP connections are established among sub-ASs in a confederation, and the sub-ASs need to be fully meshed.

All member devices in a confederation need to be reconfigured.

The logical topology does not need to be changed when a confederation is used.

Discussion 0

Question # 87

An ACL can be used to match routes or data, but cannot be used to match both the IP address prefix length and mask length.

Options:

TRUE

FALSE

Discussion 0

Question # 88

An enterprise uses OSPF to implement network communication. To ensure data validity and security, all authentication modes supported by OSPF are enabled on routers. In this case, interface authentication is preferentially used by the routers.

Options:

TRUE

FALSE

Discussion 0

Question # 89

On an IS-IS network, areas are divided by router, and a router can belong to only one area. Therefore, an IS-IS router only needs to maintain the LSDB of its area.