What are two reasons for creating multiple areas in OSPF? (Choose two.)
Correct Answer: A,D
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time . This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change. Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.
Question 37
Referring to the exhibit, which three statements are correct? (Choose three.)
Correct Answer: A,B,C
The IP source guard is enabled. The configuration shows that ip-source-guardis explicitly enabled under dhcp-security. Dynamic ARP inspection is enabled. The configuration also includes arp-inspectionunder dhcp-security, which indicates that Dynamic ARP Inspection (DAI) is enabled. DHCP snooping is enabled. DHCP snooping is implied as enabled because both IP source guard and ARP inspection are dependent on the DHCP snooping database to function properly. Even though DHCP snooping is not explicitly mentioned, its presence is required for these features to work.
Question 38
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario? (Choose two.)
Correct Answer: C,D
In BGP, routing policies are used to control the flow of routing information between BGP peers. Option C suggests that import policies are applied after the RIB-In table. This is correct because import policies in BGP are applied to routes that are received from a BGP peer, before they are installed in the local BGP Routing Information Base (RIB-In). The RIB-In is a database that stores all the routes that are received from all peers. Option D suggests that export policies are applied after the RIB-Local table. This is correct because export policies in BGP are applied to routes that are being advertised to a BGP peer, after they have been selected from the local BGP Routing Information Base (RIB-Local). The RIB-Local is a database that stores all the routes that the local router is using.
Question 39
Which statement is correct about controlling the routes installed by a RIB group?
Correct Answer: A
Explanation A RIB group is a configuration that allows a routing protocol to install routes into multiple routing tables in Junos OS. A RIB group consists of an import-rib statement,which specifies the source routing table, and an export-rib statement, which specifies the destination routing table or group. A RIB group can also include an import-policy statement, which specifies one or more policies to control which routes are imported into the destination routing table or group1. An import policy is a policy statement that defines the criteria for accepting or rejecting routes from the source routing table. An import policy can also modify the attributes of the imported routes, such as preference, metric, or community. An import policy can be applied to a RIB group by using the import-policy statement under the [edit routing-options rib-groups] hierarchy level1. Therefore, option A is correct, because an import policy is applied to the RIB group to control which routes are installed in the destination routing table or group. Option B is incorrect, because all routes in the source routing table are imported into the destination routing table or group, unless filtered by an import policy. Option C is incorrect, because a firewall filter is not used to install routes in the RIB groups; a firewall filter is used to filter packets based on various criteria. Option D is incorrect, because an export policy is not applied to the RIB group; an export policy is applied to a routing protocol to control which routes are advertised to other devices. References: 1: rib-groups | Junos OS | Juniper Networks
Question 40
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)
