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NEW QUESTION # 22
In the VPC interworking scenario, traffic is checked and filtered only by the firewall in the source or destination VPC.
Answer: A
Explanation:
In Huawei's CloudFabric Solution, Virtual Private Clouds (VPCs) enable isolated network environments, and interworking scenarios involve traffic between VPCs. The statement claims that traffic is checked and filtered only by the firewall in the source or destination VPC. Let's evaluate:
VPC Interworking: Traffic between VPCs can be routed via a gateway (e.g., a Layer 3 gateway or centralized router) and may involve multiple security checkpoints depending on the design.
Firewalls can be deployed in the source VPC, destination VPC, or a centralized location (e.g., a service chain or border gateway).
Firewall Role: The statement implies exclusivity (only one firewall), but in practice, traffic may be filtered by firewalls at both ends, a centralized firewall, or additional security devices (e.g., VAS nodes) in the path. For example, inter-VPC traffic might pass through a firewall in the source VPC for egress filtering and another in the destination VPC for ingress filtering, or a shared firewall in a hub- and-spoke model. Huawei's security architecture (e.g., with SecoManager) supports distributed or centralized filtering, not limited to a single VPC's firewall.
The statement is FALSE (B) because traffic is not restricted to being checked and filtered only by the firewall in the source or destination VPC; multiple firewalls or security devices may be involved.
NEW QUESTION # 23
An engineer enables ECMP in a spine-leaf fabric. Which condition must exist before multiple equal-cost paths can be installed simultaneously into the routing table?
Answer: C
Explanation:
ECMP requires routes to the same destination with identical metrics or equal path costs. The forwarding plane then balances traffic among those next hops. Unequal costs generally result in selection of only the best route.
NEW QUESTION # 24
When deploying VXLAN, why is an IP underlay generally preferred over a large Layer 2 network?
Answer: A
Explanation:
An IP underlay provides scalable routing, rapid convergence, and efficient ECMP forwarding.
Large Layer 2 domains are more susceptible to flooding and spanning-tree limitations, reducing overall scalability and operational efficiency.
NEW QUESTION # 25
In EVPN, Type 5 routes are used only by hosts on a VXLAN network to access external networks.
Answer: A
Explanation:
EVPN (Ethernet VPN) is a control plane technology used with VXLAN to provide Layer 2 and Layer 3 services in data center networks, including Huawei's implementations. EVPN routes are categorized into types, with Type 5 routes (IP Prefix routes) serving a specific purpose:
Type 5 Routes: These routes advertise IP prefixes and are used for inter-subnet routing, allowing communication between different VXLAN Virtual Network Identifiers (VNIs) or between VXLAN networks and external networks. They carry a Layer 3 VNI and IP prefix information, enabling routers or gateways to perform Layer 3 forwarding.
Usage Scope: Type 5 routes are not limited to hosts on a VXLAN network accessing external networks. They are also used by network devices (e.g., gateways, routers) within the EVPN domain to facilitate routing between subnets, including intra-VXLAN communication. For example, a centralized gateway or distributed gateway can use Type 5 routes to route traffic within the data center or to external networks, not just host-initiated access.
The statement is FALSE (B) because Type 5 routes are not exclusively for hosts on a VXLAN network to access external networks; they support broader Layer 3 routing functions across the EVPN domain.
NEW QUESTION # 26
An administrator notices that unknown unicast traffic has increased after adding several new hosts. Which EVPN mechanism most directly reduces this unnecessary flooding?
Answer: A
Explanation:
EVPN distributes endpoint MAC information using BGP, enabling remote VTEPs to forward traffic directly without relying on flooding. This significantly decreases unknown unicast traffic compared with traditional data center switching.
NEW QUESTION # 27
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