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| Section | Objectives |
|---|---|
| Topic 1: Tunnels | - Tunnel technologies |
| Topic 2: Layer 2 Switching or VLANs | - Inter-VLAN routing - Native VLANs and voice VLANs - Bridging components - Frame processing - VLAN concepts and functionalities - Ports and tagging - Configuration, monitoring, and troubleshooting |
| Topic 3: BGP | - BGP configuration and troubleshooting |
| Topic 4: Protocol Independent Routing | - Routing fundamentals |
| Topic 5: High Availability | - High availability design and integration - VRRP and redundancy protocols |
| Topic 6: Spanning Tree Protocol | - Bridge priority and port cost optimization - Loop prevention and redundancy - Port roles interpretation - Convergence issues identification - STP topology design and troubleshooting |
| Topic 7: IS-IS | - IS-IS configuration and troubleshooting |
| Topic 8: Layer 2 Security | - DHCP snooping - Port security implementation - Dynamic ARP inspection - Common Layer 2 attack mitigation |
| Topic 9: OSPF | - OSPF configuration and troubleshooting |
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NEW QUESTION # 87
Which statement is correct about controlling the routes installed by a RIB group?
Answer: D
Explanation:
When routes are placed into a RIB group, an import policy can be applied to determine which routes are accepted into that group. This policy helps in controlling which routes get installed or filtered into the RIB group from various sources like other routing protocols or static routes.
https://www.juniper.net/documentation/us/en/software/junos/static-routing/topics/ref/statement/rib- groups-edit-routing-options.html
NEW QUESTION # 88
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system?
(Choose two.)
Answer: A,C
Explanation:
BGP has a simple loop prevention mechanism for eBGP that checks the AS path for its own AS number.
However, this mechanism does not work for iBGP, since all routers in the same AS have the same AS number. Therefore, iBGP has two additional rules to prevent routing loops within an autonomous system:
A router does not advertise a route learned from an iBGP neighbor to another iBGP neighbor. This rule ensures that a route does not loop back to the original iBGP router through another iBGP path.
A router does not accept a route learned from an iBGP neighbor if the next hop is not reachable via an IGP.
This rule ensures that a router does not forward packets to an unreachable next hop.
These two rules imply that iBGP sessions must be configured as a logical full mesh, meaning that every iBGP router must have a direct iBGP session with every other iBGP router in the same AS. This way, every iBGP router can learn the best route from the eBGP routers and use the IGP to reach the next hop. A logical full mesh does not require a physical full mesh, meaning that iBGP routers do not have to be directly connected.
They can use intermediate routers to establish iBGP sessions, as long as the IGP can reach the next hop.
A logical full mesh can be challenging to scale and maintain, especially for large ASes with many iBGP routers. Therefore, some alternatives to the full mesh requirement have been developed, such as route reflectors and confederations. These alternatives relax the iBGP rules and introduce additional attributes and mechanisms to prevent routing loops, such as originator ID and cluster list. References:
BGP Fundamentals
BGP - eBGP loop prevention mechanism same AS number
Loop Prevention in BGP Routing
NEW QUESTION # 89
What is the default MAC age-out timer on an EX Series switch?
Answer: A
Explanation:
Explanation
The default MAC age-out timer on an EX Series switch is 300 seconds12. The MAC age-out timer is the maximum time that an entry can remain in the MAC table before it "ages out," or is removed31. This configuration can influence efficiency of network resource use by affecting the amount of traffic that is flooded to all interfaces1. When traffic is received for MAC addresses no longer in the Ethernet routing table, the router floods the traffic to all interfaces1.
NEW QUESTION # 90
Referring to the exhibit, the local router should have an IS-IS adjacency with a neighboring router, but the adjacency never establishes correctly.
What should you do to solve the problem?
Answer: B
NEW QUESTION # 91
Which statement is true about IP-IP tunnels?
Answer: A
NEW QUESTION # 92
......
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