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Huawei HCIP-Datacom-Core Technology V1.0 Sample Questions (Q15-Q20):

NEW QUESTION # 15
On a network, some switches are enabled with RSTP and some switches are enabled with STP. What will happen?

A. A Huawei switch changes from RSTP to STP. After the STP-enabled switch is removed from the network, the RSTP-enabled switch can be moved back to the RSTP mode.
B. A Huawei switch changes its mode from STP to RSTP. After the RSTP-enabled switch is removed from the network, the STP-enabled switch can be moved back to the RSTP mode.
C. STP and RSTP are compatible with each other, but the rapid convergence of RSTP is unavailable.
D. STP and RSTP calculation are performed independently.

Answer: A,C

Explanation:
When STP and RSTP coexist in a network, RSTP switches will downgrade their operation to STP to ensure compatibility. However, this disables RSTP's rapid convergence features, as the protocol behaves like STP to maintain interoperability .

NEW QUESTION # 16
See the network shown in the following figure.

R1 and R2 run IS-IS and establish an adjacency. IS-IS is enabled on Loopback0 of R2 but disabled on Loopback3 of R2. The configurations shown in the figure are performed in the IS-IS process of R2. Which of the following statements are true?

A. The routing table of R1 contains the route 10.0.2.2/32.
B. The routing table of R1 does not contain the route 10.0.2.3/32.
C. The routing table of R1 contains the route 10.0.2.3/32.
D. The routing table of R1 does not contain the routes 10.0.2.2/32 and 10.0.2.3/32.

Answer: A,B

Explanation:
In the provided configuration, IS-IS is enabled on Loopback0 but not on Loopback3 of R2. As a result, R2 will advertise the route 10.0.2.2/32 (from Loopback0) to R1 through IS-IS. However, the route 10.0.2.3/32 will not be advertised because IS-IS is not enabled on that loopback interface. The import-route direct command does not override this behavior .

NEW QUESTION # 17
On a BGP network, a route-policy can be used to modify route attributes. Which of the following statements is false about route-policies?

A. In the address family view, the peer command can be run to reference a route-policy to modify the local preference of the routes to be advertised.
B. When direct routes are imported using the import command, a route-policy can be used to filter out the routes that you do not want to advertise.
C. When routes are imported using the network command, a route-policy cannot be used to modify the attributes of the imported routes.
D. When OSPF routes are imported using the import command, a route-policy can be used to change their default MED value.

Answer: D

Explanation:
Comprehensive and Detailed In-Depth Explanation:
* OSPF-to-BGP route redistribution does not allow modification of MED values directly using a route-policy in Huawei devices.
* Instead, MED can be set using a BGP attribute policy, not through the import command.
* All other options (B, C, D) are correct:
* B # Route-policy can filter imported direct routes.
* C # network command does not modify attributes, only announces existing routes.
* D # peer command can set Local Preference via route-policy.
# Reference: Huawei HCIA-Datacom Study Guide, BGP Route Policy and Attribute Modification.

NEW QUESTION # 18
A session is an entry used to record the connection status of a protocol and is fundamental for the firewall to forward packets. Which of the following protocol packets will the firewall create sessions for?

A. GRE
B. Subsequent fragment
C. ICMP error packet
D. TCP

Answer: A,D

Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
1. What is a Firewall Session?
* A firewall session is an entry used to maintain the connection state of a protocol.
* When a packet is forwarded, the firewall creates a session for it and tracks subsequent packets for the same connection to ensure efficient forwarding and security enforcement.
2. Analysis of Each Option:
Option A: Subsequent fragment
* Incorrect.
* A session is created for the initial fragment of a packet. Subsequent fragments are matched to the existing session and do not trigger the creation of a new session.
Option B: ICMP error packet
* Incorrect.
* ICMP error packets (e.g., Destination Unreachable) are considered exceptions and do not create new sessions.
Option C: GRE (Generic Routing Encapsulation)
* Correct.
* GRE is a tunneling protocol that encapsulates packets. A firewall creates a session for GRE traffic to track the state of the encapsulated connection.
Option D: TCP (Transmission Control Protocol)
* Correct.
* TCP is a connection-oriented protocol, and firewalls create sessions for TCP connections to track their state (e.g., SYN, SYN-ACK, FIN).
3. Summary:
* The firewall creates sessions for GRE and TCP protocols.
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "Firewall Session Management."

NEW QUESTION # 19
Which of the following messages are sent when BGP establishes peer relationships?

A. Keepalive
B. Open
C. Update
D. Hello

Answer: A,B,C

Explanation:
Comprehensive and Detailed in-depth Step-by-Step Explanation:BGP (Border Gateway Protocol) uses specific message types to establish and maintain peer relationships between routers. The primary BGP messages involved during the establishment and maintenance of peer relationships are:
* Open (D):
* The Open message is the first message sent after a TCP connection is established between BGP peers.
* It is used to exchange parameters such as the AS number, BGP version, hold time, and BGP identifier.
* Keepalive (A):
* After the Open message exchange, Keepalive messages are sent periodically to maintain the BGP session.
* These messages confirm that the connection is still alive.
* Update (C):
* Update messages are used to exchange routing information after the peer relationship is established.
* They contain information about network prefixes and their associated path attributes.
* Hello (B):
* Hello messages are not used in BGP. They are typically used in protocols like OSPF or IS-IS to establish and maintain neighbor relationships.
Thus, the correct answers are A (Keepalive), C (Update), and D (Open).
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "BGP Message Types".
* RFC 4271 - Border Gateway Protocol 4 (BGP-4).

NEW QUESTION # 20
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