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Updated H12-891_V1.0 - Real HCIE-Datacom V1.0 Braindumps

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H12-891_V1.0 Practice Materials: HCIE-Datacom V1.0 - H12-891_V1.0 Test Preparation - Itcertmaster

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Huawei HCIE-Datacom V1.0 Sample Questions (Q268-Q273):

NEW QUESTION # 268
In an MPLS VPN network, different CE devices exchange routing information with the same PE device using different routing protocols, and different CE devices use routing protocols that are independent of each other

A. True
B. False

Answer: A

NEW QUESTION # 269
Regarding the FTP protocol, is it correct in the description below?

A. FTP always uses the TCP port to establish a data session and ICP port 21 to establish a control session
B. FTP always uses TCP port 21 to establish a data session and TCP port 20 to establish a control session
C. In ftP-style, the client completes the initialization of the TCP session for control and data
D. FTP always uses a TCP session to transmit control information and data information
E. In ftP Activee, the server side tells the client which port it expects to send data on by commanding
"PORT"

Answer: C

NEW QUESTION # 270
As shown in the figure, SW1 and SW2 use asymmetric IRB (Integrated Routing and Bridging) forwarding, and PC1 and PC2 communicate with each other. Which of the following is the destination MAC address of the original data frame in the packet sent from VTEP1 to VTEP2?

A. MAC C
B. MAC B
C. MAC A
D. MAC D

Answer: A

Explanation:
Comprehensive and Detailed In-Depth Explanation:
1. Understanding VXLAN Asymmetric IRB Forwarding:
InVXLAN (Virtual Extensible LAN)networks, there are two types of IRB forwarding:Symmetric IRBandAsymmetric IRB.
InAsymmetric IRB, routing occurs only at the ingress VTEP (Virtual Tunnel Endpoint).
Theingress VTEP (VTEP1)encapsulates the original data frame and sends it to theegress VTEP (VTEP2)over the VXLAN tunnel.
Thedestination MAC addressof the original Ethernet frame is theMAC address of the Layer 3 gateway (VBDIF)at the egress VTEP.
2. Analyzing the Topology:
PC1 (172.16.2.1/24) withMAC Ais sending traffic to PC2 (172.16.1.2/24) withMAC D.
Both PCs are in different subnets, so inter-subnet routing is required.
VTEP1 (1.1.1.1)on SW1 is the ingress VTEP.
VTEP2 (2.2.2.2)on SW2 is the egress VTEP.
TheVXLAN Network Identifier (VNI)for the traffic is100.
SW1 has two VBDIF interfaces:
VBDIF10 (MAC B)- Interface for BD10 (172.16.2.254).
VBDIF20 (MAC C)- Interface for BD20 (172.16.1.254).
3. Packet Flow in Asymmetric IRB:
Step 1:PC1 sends a packet destined for PC2. The packet is routed at theingress VTEP (SW1)using theVBDIF interface (VBDIF10 with MAC B).
Step 2:Theingress VTEP (SW1)encapsulates the packet in aVXLAN header(VNI 100) and sends it toVTEP2.
Step 3:Theoriginal data frame inside the VXLAN packetmust have adestination MAC addressthat matches thegateway MAC address (VBDIF20 - MAC C)at theegress VTEP (SW2).
Step 4:On reachingVTEP2, the encapsulation is removed, and the original frame withdestination MAC Cis forwarded.
Step 5:VTEP2performs Layer 3 routing to forward the packet toPC2.
4. Why MAC C is Correct:
Inasymmetric IRB forwarding, the routing decision at the ingress VTEP ensures that thedestination MACin the original frame is set to theVBDIF (gateway) MAC of the egress VTEP.
Since theegress VTEP (SW2)hasVBDIF20 (MAC C)for the destination subnet (172.16.1.0/24), thedestination MAC addressof the original frame isMAC C.

NEW QUESTION # 271
Although the STP protocol can solve the loop problem, it affects the quality of user communication due to the slow convergence of the network topology. RSTP has made many improvements to STP, which of the following is not an improvement of RSTP to STP?

A. RSTP port state specification is divided according to whether the port forwards user traffic and learns the MAC address, reducing the original 5 port states to 3
B. If a port does not receive a configuration BPDU sent by the upstream device for 4 consecutive Hello Time, the device considers the negotiation with this neighbor to fail
C. In addition to the 3 port states, RSTP vice adds 2 new port roles
D. Non-root switches running RSTP send configuration BPDUs at intervals specified by Hello Timer, a behavior that is entirely autonomous for each device

Answer: B

NEW QUESTION # 272
In a scenario where a VXLAN tunnel is dynamically established through BGP EVPN, run the command on the VTEP to view BGP EVPN routes. The route entries shown in the following figure are displayed. Which of the following statements about these routing entries are correct?
Network (EthTagId/IP Prefix/IP PrefixLen)
NextHop
*>i 0:172.16.2.0:24 1.1.1.2
*>i 0:172.16.13.0:24 1.1.1.2
*>i 0:192.168.122.0:30 1.1.1.2

A. These routes carry the L2VNI.
B. These routes carry the L3VNI.
C. These routes are Type 5 routes and carry network segment or mask information.
D. These routes are Type 2 routes and carry host IP addresses.

Answer: B,C

Explanation:
Understanding BGP EVPN Route Types for VXLAN
# BGP EVPN (Ethernet VPN) is used for VXLAN control-plane learning.
# EVPN Type 2 Route (MAC/IP Advertisement)
* Carries: MAC + Host IP
* Used for: L2 forwarding, Host Mobility
# EVPN Type 5 Route (IP Prefix Advertisement)
* Carries: Network segment (Subnet) + Prefix
* Used for: VXLAN L3 routing
# What Do the Given Route Entries Show?
* 0:172.16.2.0/24
* 0:172.16.13.0/24
* 0:192.168.122.0/30
# These are IPv4 Subnets, NOT individual MACs.# Since they carry IP Prefixes, they belong to EVPN Type 5.
Analysis of the Answer Choices:
# A. These routes are Type 5 routes and carry network segment or mask information.
* Correct: The displayed routes carry network prefixes, which belong to EVPN Type 5.
# B. These routes are Type 2 routes and carry host IP addresses.
* Incorrect: Type 2 routes carry MAC + Host IP, NOT full subnets.
# C. These routes carry the L2VNI.
* Incorrect: L2VNI is for Layer 2 VXLAN bridging, but these are IP Prefix Routes (L3 routing).
# D. These routes carry the L3VNI.
* Correct: Type 5 routes are used for VXLAN L3 routing, which means they belong to L3VNI.
Real-World Application:
* VXLAN L3 Gateways: Type 5 routes enable distributed routing between VXLAN segments.
* Data Center Networks: Used to interconnect virtual machines (VMs) across different subnets.
# Reference: Huawei HCIE-Datacom Guide - BGP EVPN & VXLAN L3 Routing

NEW QUESTION # 273
......

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