On the network shown in the figure, EBGP peer relationships are established between neighboring routers through directly connected interfaces. The router ID of each router is 10.0.X.X, and the AS number is 6500X, where X is the number of the router. Both R1 and R4 have static routes to 192.168.1.0/24, which are imported to BGP through the import-route command. R1 adds a community attribute (1:1) to the route when sending the route to its peers. All routers on the network are enabled to transmit the community attribute. Which of the following ensures that the traffic from R3 to 192.168.1.0/24 passes through R4?
Answer(s): A
In this scenario, traffic from R3 to 192.168.1.0/24 should be directed via R4, not R1. R1 and R4 are both redistributing the static route for 192.168.1.0/24 into BGP, but R1 is tagging the route with a community attribute (1:1). Since all routers are enabled to transmit the community attribute, we need a mechanism to prevent the route learned from R1 from being preferred over the route learned from R4.
The display current-configuration | include 10.0.2.* command can be run on a router to display all information about the current configuration that contains 10.0.2.
The command display current-configuration | include 10.0.2.* is used in Huawei devices to filter and display configuration lines that contain the specified pattern 10.0.2.*. The include keyword works as a filtering function, ensuring that only lines matching the given string or regex pattern appear in the output.The display current-configuration command shows the full configuration of the router.The | include 10.0.2.* filter ensures that only lines containing 10.0.2. in any form (such as 10.0.2.1, 10.0.2.255, etc.) are displayed.
Prefix-based outbound route filtering (ORF) enables a device to send locally configured prefix-based import policies to its BGP peers through Route-refresh messages. The BGP peers construct export policies based on the received policies to filter routes to be advertised. Compared with configuring routing policies on BGP peers, this method prevents the local device from receiving a large number of useless routes, and reduces the CPU usage and configuration workload on the local device.
Prefix-based Outbound Route Filtering (ORF) is a BGP capability that allows a router to inform its BGP peers about the prefixes it wants to receive, instead of relying solely on inbound filtering after receiving routes. This is achieved using Route-Refresh messages.Key Benefits of Prefix-based ORF: 1. Reduces Unnecessary Route Advertisements: Instead of sending all routes and filtering them at the receiver's end, the sender only advertises the routes that the receiver actually needs. 2. Optimizes CPU and Memory Usage: Since unwanted routes are not received in the first place, the local device does not need to process or store them. 3. Minimizes Configuration Complexity: The need for extensive manual filtering on BGP peers is reduced,-simplifying configuration and management.-
An advanced ACL defines rules based on information such as the source IP address, destination IP address, IP protocol type, TCP source/destination port number, and UDP source/destination port number. You can use a routing policy to invoke an advanced ACL to implement BGP route control.
An Advanced ACL (Access Control List) can define rules based on multiple parameters, including:-Source IP address-Destination IP address-IP protocol type (e.g., TCP, UDP, ICMP, etc.)-TCP/UDP source and destination port numbersIn BGP route control, a routing policy can invoke an Advanced ACL to filter routes based on specified criteria. This allows for fine-grained route filtering and policy enforcement.For example:-You can deny or permit routes that match specific prefixes.-You can control which routes are accepted, advertised, or suppressed.-It helps optimize BGP operations by preventing unwanted routes from being propagated.-
The first word in the output of the display version | begin uptime command run on a router is uptime.
Answer(s): B
The command display version | begin uptime is used on Huawei routers to display system version information starting from the line that contains the keyword "uptime".However, the first word in the output is not necessarily "uptime". Instead, the command begins displaying output from the line where "uptime" appears, but the first word on that line is usually something like "Router" or the device hostname, followed by the uptime information.
FILL BLANKOn the network shown in the figure, R1 and R2 use directly connected interfaces to establish an EBGP peer relationship, and BFD is enabled in the BGP process. The minimum interval for sending BFD packets is 1000 ms, the minimum interval for receiving BFD packets is 1000 ms, and the detection multiplier is 6. If GE0/0/0 of R1 is shut down, the BGP peer relationship of R1 changes from Up to Down after______ seconds. (Enter only digits.)
To calculate the time it takes for the BGP peer relationship to go from Up to Down after GE0/0/0 of R1 is shut down, we use the Bidirectional Forwarding Detection (BFD) parameters provided:-Minimum interval for sending BFD packets = 1000 ms (1 second)-Minimum interval for receiving BFD packets = 1000 ms (1 second)-Detection multiplier = 6BFD Timeout = Min interval x Detection multiplier = 1 sec x 6 = 6 seconds
On the OSPFv3 network shown in the figure, area 1 is a common area. R2 generates an Inter-Area-Prefix-LSA to describe the routes of a network segment in the area. Such an LSA exists in both area 0 and area 1.
In OSPFv3 (for IPv6), Inter-Area-Prefix-LSAs (Type 3 LSAs) are used by ABRs (Area Border Routers) to advertise IPv6 prefixes from one area to another.R2 is an ABR because it connects Area 0 (Backbone) and Area 1 (Common Area). If a network segment exists in Area 1, R2 will generate an Inter-Area-Prefix-LSA and advertise it into Area 0. Similarly, R2 will also generate an Inter-Area-Prefix-LSA to describe prefixes learned from Area 0 and advertise them into Area 1. This means that the Inter-Area-Prefix-LSA exists in both areas (Area 0 and Area 1).
The figure shows information about an LSP generated by an ISTS router. From the LSP, you can infer that the router is not the DIS of the local link.
In Intermediate System to Intermediate System (IS-IS), the Designated Intermediate System (DIS) is responsible for generating pseudonodes and additional LSPs for the local link. If a router is the DIS, its LSPs will contain additional pseudonode information representing the broadcast network.From the LSP output, there is no indication of a pseudonode (PN) LSP, which suggests that this router is not the DIS. Instead, it is a regular IS-IS router participating in the network without acting as the designated one for the link.
Post your Comments and Discuss Huawei H12-831 exam prep with other Community members:
Our website is free, but we have to fight against AI bots and content theft. We're sorry for the inconvenience caused by these security measures. You can access the rest of the H12-831 content, but please register or login to continue.