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| Section | Objectives |
|---|---|
| Topic 1: IPv6 and Advanced IP Technologies | - IPv6 deployment
|
| Topic 2: Data Center and Virtualization Technologies | - VXLAN and overlay networks
|
| Topic 3: Enterprise Network Architecture | - Network design principles
|
| Topic 4: Network Security and QoS | - QoS mechanisms
|
| Topic 5: WAN and VPN Technologies | - MPLS fundamentals
|
| Topic 6: Routing and Switching Technologies | - IP routing protocols
|
| Topic 7: Network Automation and Programmability | - SDN and automation
|
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NEW QUESTION # 10
Refer to the output information of a device below. According to the information, which of the following MPLS labels is carried in a data packet forwarded by the device to 10.0.1.1?
Answer: C
Explanation:
Comprehensive and Detailed Explanation:
# MPLS labels in SR-MPLS are calculated using the SRGB (Segment Routing Global Block) base and the Prefix-SID.
# Label Calculation Formula:
MPLS Label=SRGB Base+Prefix-SID\text{MPLS Label} = \text{SRGB Base} + \text{Prefix-SID} MPLS Label=SRGB Base+Prefix-SID
# Extracting Values from the LSDB:
* SRGB Base: 36000
* Prefix-SID: 300
# Valid MPLS Labels:
* 36000 + 300 = 36300
* 40002 and 38002 fall within the SRGB range.
* 39002 is outside the expected range, making it the incorrect answer.
# Reference: Huawei HCIE Datacom - Segment Routing Label Calculation
NEW QUESTION # 11
Which of the following community attributes ensure that BGP routes are transmitted only within an AS?
Answer: A
Explanation:
In BGP, community attributes help control the advertisement scope of BGP routes. Here's what each option means:
No_Export: This well-known community attribute prevents BGP routes from being advertised to external BGP (EBGP) peers. Routes with this attribute can still be advertised to internal BGP (IBGP) peers within the same AS. This ensures that the route remains within the originating AS.
No_Advertise: This attribute means that the route should not be advertised toanyBGP peer, whether internal or external.
Internet: Indicates that the route can be advertised to all BGP peers, both internal and external, with no restrictions.
No_Export_Subconfed: Similar to No_Export, but it also restricts advertisement to peers within a BGP confederation. It's more specific and not generally used just to keep routes inside one AS.
Therefore, the correct answer isB. No_Export, as it is the attribute that ensures BGP routes remain within the AS by not being sent to EBGP peers.
NEW QUESTION # 12
As shown in the figure, R1, R2, R3, and R4 reside in the same MPLS domain, and LDP (Label Distribution Protocol) is used to distribute MPLS labels.
R4 is the egress LSR (Label Switching Router) for the FEC (Forwarding Equivalence Class) 4.4.4.0/24.
To make R4 aware of QoS forwarding priority of a packet sent from R1 and destined for 4.4.4.0/24, Without looking up R4's label forwarding information base, The outgoing label of the FEC on R3 should be _____ (Enter an Arabic numeral without symbols).
Answer:
Explanation:
0
Explanation:
Understanding MPLS LDP and PHP (Penultimate Hop Popping):
# Label Distribution in MPLS LDP:
* LDP assigns labels to FECs so that routers can forward packets based on labels rather than IP lookup.
* Labels are advertised downstream (from R4 to R3, R3 to R2, and so on).
# Penultimate Hop Popping (PHP) Concept:
* The egress LSR (R4) does not require an incoming label for 4.4.4.0/24.
* Instead, R3 (Penultimate LSR) removes the label before forwarding the packet to R4.
* R3 forwards the packet as an IP packet, not an MPLS packet, to avoid an unnecessary label lookup at R4.
* In MPLS LDP, the label "0" is used to indicate an implicit NULL label (PHP operation).
Why the Answer is "0" (Implicit NULL Label)?
# Since R4 is the egress LSR, it does not need a label for 4.4.4.0/24.# R3 assigns the outgoing label as "0" (Implicit NULL Label) to indicate that the label should be removed before sending to R4.# R4 receives the packet as a pure IP packet (no MPLS label).
Why Other Answers Are Incorrect?
# Any value other than "0"
* If R3 assigns a label (e.g., 100), R4 would need to perform an unnecessary MPLS lookup, which is inefficient.
* Using "0" ensures PHP occurs, optimizing the forwarding process.
# Reference: Huawei HCIE Datacom - MPLS LDP and Penultimate Hop Popping (PHP)
NEW QUESTION # 13
Regarding Policy Routing, the following description error is ?( Single choice questions).
Answer: D
NEW QUESTION # 14
After BGP introduces routes for other protocols, the next hop in the BGP routing table is consistent with the next hop of the introduced routing protocol
Answer: B
NEW QUESTION # 15
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