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Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer : A, C
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1.There are four categories of BGP attributes123:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.
Optional transitive: May not be supported by all implementations of BGP1.
Optional non-transitive: May not be supported by all implementations of BGP1.
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123.These include the AS path and next hop attributes23. Therefore, options A and C are correct.
Exhibit
Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?
Answer : B
The exhibit shows the configuration of BFD liveness detection for BGP at the global level, which applies to all BGP neighbors by default1.However, this configuration does not specify the session mode, which determines whether BFD uses single-hop or multihop mode to communicate with a neighbor2.
For single-hop BGP neighbors, which are directly connected on the same subnet, the session mode can be either automatic or single-hop.For multihop BGP neighbors, which are not directly connected and require multiple hops to reach, the session mode must be multihop2.
Since your BGP neighbors are in different countries, they are likely to be multihop neighbors.Therefore, you need to configure the session mode as multihop for each neighbor individually at the [edit protocols bgp group group-name neighbor address bfd-liveness-detection] hierarchy level2. For example:
protocols { bgp { group usa { neighbor 192.0.2.1 { bfd-liveness-detection { session-mode multihop; } } } group france { neighbor 198.51.100.1 { bfd-liveness-detection { session-mode multihop; } } } } }
If you do not configure the session mode for multihop neighbors, BFD will use the default mode of automatic, which will try to use single-hop mode and fail to establish a BFD session with the remote neighbor2. This will prevent BGP from using BFD to detect liveliness and failover.
Therefore, the answerBis correct, as you need to configure the BFD liveness detection on the BGP neighbor level with the appropriate session mode for multihop neighbors.
Which two statements are true about the default VLAN on Juniper switches? (Choose two.)
Answer : A, D
On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default12.This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN12. Therefore, option A is correct.
The default VLAN ID can be changed12.This allows network administrators to configure the switch to use a different VLAN as the default, if necessary12. Therefore, option D is correct.
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)
Answer : B, C
Bis correct because duplex and speed settings are required to match on both participating devices.According to the Juniper Networks documentation1, all the interfaces in a LAG must have the same speed and be in full-duplex mode. This ensures that the LAG can operate as a single logical link without any performance or compatibility issues.
Cis correct because member links are not required to be contiguous ports.According to the Juniper Networks documentation2, you can group any Ethernet interfaces on a switch into a LAG, regardless of their physical location or slot number. This provides flexibility and scalability for configuring LAGs on switches.
Exhibit
What does the * indicate in the output shown in the exhibit?
Answer : C
The exhibit shows the output of the commandshow vlans brief, which displays brief information about VLANs and their associated interfaces1.
The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging.
The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic1.This can be verified by the commandshow interfaces terse, which displays the status of the interfaces2.
