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| Section | Objectives |
|---|---|
| Topic 1: OSPF | - OSPFv2/v3 concepts, areas, LSA types - Neighbor relationships, route calculation - Configuration, monitoring and troubleshooting |
| Topic 2: Protocol Independent Routing | - Routing policy and firewall filters - Static routes, aggregate routes - Routing tables, routing preferences - Configuration, monitoring and troubleshooting |
| Topic 3: Layer 2 Security | - Dynamic ARP inspection, DHCP snooping - Layer 2 firewall filters - Port security, storm control, MAC limiting - Configuration, monitoring and troubleshooting |
| Topic 4: High Availability | - Graceful restart, nonstop active routing - Virtual Chassis, redundant routing engines - Configuration, monitoring and troubleshooting |
| Topic 5: Layer 2 Switching and VLANs | - Layer 2 switching concepts and operation - VLAN concepts, tagging, ports, native VLAN - Inter-VLAN routing - Configuration, monitoring and troubleshooting |
| Topic 6: BGP | - IBGP, EBGP, route policies - BGP concepts, attributes, path selection - Configuration, monitoring and troubleshooting |
| Topic 7: Spanning Tree Protocol | - STP, RSTP, MSTP concepts and operation - Root bridge, port roles and states - Configuration, monitoring and troubleshooting |
| Topic 8: Tunnels | - IP-IP, GRE, IPsec tunnels - Configuration, monitoring and troubleshooting |
| Topic 9: IS-IS | - IS-IS concepts, levels, routing information - Configuration, monitoring and troubleshooting |
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NEW QUESTION # 17
Which three actions are required for filter-based forwarding? (Choose three.)
Answer: B,C,D
NEW QUESTION # 18
Exhibit
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?
Answer: A
Explanation:
* The exhibit shows the output of the command show ip bgp , which displays information about the BGP routes in the routing table 1 . The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
* The route from R1 has a local preference of 200, while the route from R2 has a local preference of
100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS) 2 . A higher local preference means a more preferred route 2 .
* BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence 3
. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router 3 . If the weight is equal or not set, the next attribute that is compared is local preference 3 .
* In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers 3 . Therefore, the next attribute that is compared is local preference. Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table 3 . The other attributes, such as origin code and AS path, are not considered in this case.
NEW QUESTION # 19
You are asked to create a default route that will be advertised to your internal OSPF neighbors. You have three upstream connections to the Internet and you must ensure that when available, all traffic uses ISP1 as your primary connection and only uses ISP2 and ISP3 when ISP1 is not available.
Which solution should you implement in this scenario?
Answer: C
Explanation:
The solution that should be implemented in this scenario is to create a default generate route that includes an import policy to match BGP routes from ISP1 and assign a preference value of four or less. This way, the default route will be advertised to the internal OSPF neighbors only when there is a BGP route from ISP1 in the routing table, and it will have a higher preference than any other default route from ISP2 or ISP3. If ISP1 is not available, the default generate route will be withdrawn and the traffic will use the next available default route from ISP2 or ISP3.
Option A is incorrect because creating a default static route with ISP1's address as the next hop while specifying the addresses for ISP2 and ISP3 as qualified next hops with a preference value of six or higher will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will have a lower preference than any other default route from ISP2 or ISP3.
Option C is incorrect because creating a default static route with each neighbor address as the next hop will not ensure that all traffic uses ISP1 as the primary connection and only uses ISP2 and ISP3 when ISP1 is not available. The default static route will always be in the routing table regardless of the availability of ISP1, and it will load balance the traffic among the three ISPs.
Option D is incorrect because creating a default aggregated route will not ensure that the default route is advertised to the internal OSPF neighbors only when ISP1 is available. The default aggregated route will always be in the routing table regardless of the availability of ISP1, and it will not have any preference value associated with it. References:
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
* Enterprise Routing and Switching, Specialist (JNCIS-ENT) - Juniper Networks
NEW QUESTION # 20
Which statement is correct regarding the Junos OS "show route" command output field
"Preference"?
Answer: D
Explanation:
In Junos OS, the "Preference" field displayed in the output of "show route" represents the administrative distance assigned to a route by its source protocol. When multiple routing protocols advertise a route for the same destination prefix, Junos OS selects the route with the lowest preference value as the active route in the forwarding table.
NEW QUESTION # 21
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems?
(Choose two.)
Answer: C,D
Explanation:
Explanation
BGP (Border Gateway Protocol) is a protocol designed to exchange routing and reachability information among autonomous systems (AS) on the internet1.
Option A is correct. When an EBGP router advertises routes to its neighbors, it appends its AS number to the AS_PATH attribute1. This is a key mechanism in BGP to prevent routing loops1.
Option C is correct. BGP has a built-in loop prevention mechanism whereby if a BGP router detects its own AS in the AS_PATH attribute, it will drop the prefix and will not continue to advertise it2. This helps to prevent routing loops2.
Option B is incorrect. EBGP routers do not accept routes that contain their own AS number in the AS_PATH2. Instead, they drop such routes as part of the loop prevention mechanism2.
Option D is incorrect. While it's true that EBGP routers append their AS number when advertising routes, they do not prepend their AS number1. The term "prepend" in BGP usually refers to a technique used to influence path selection by artificially lengthening the AS_PATH3.
NEW QUESTION # 22
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