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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 Bridging and VLANs | 8-12% | - VLANs and trunking - Bridging concepts - Service provider switching features |
| Topic 2: Intermediate System to Intermediate System (IS-IS) | 10-15% | - Configuration and monitoring - PDUs and TLVs - Metrics and wide metrics - Adjacencies and levels |
| Topic 3: IPv6 | 8-12% | - Autoconfiguration - Static and dynamic routing - Address types and format - OSPFv3 and BGP for IPv6 |
| Topic 4: High Availability | 5-8% | - Graceful restart - Nonstop active routing - NSR and GRES concepts |
| Topic 5: Spanning Tree Protocols | 8-12% | - Configuration and convergence - BPDU and protection features - Port roles and states - STP, RSTP, MSTP, VSTP |
| Topic 6: Protocol-Independent Routing | 10-15% | - Filter-based forwarding - Martian addresses - Static, aggregate, and generated routes - Routing instances and RIB groups - Load balancing |
| Topic 7: Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Topic 8: Multiprotocol Label Switching (MPLS) | 12-18% | - Configuration and monitoring - LDP and RSVP - Terminology and forwarding - Segment routing basics - Labels and LIB |
| Topic 9: Border Gateway Protocol (BGP) | 20-25% | - Policy and route filtering - Path selection and attributes - Basic operation and message types - Configuration and troubleshooting - IBGP and EBGP |
| Topic 10: Open Shortest Path First (OSPF) | 15-20% | - Link-state database - LSA types and operation - Configuration and troubleshooting - Areas and router types |
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NEW QUESTION # 113
Exhibit:
user@R2> show route 198.51.100.1
inet.0: 19 destinations, 19 routes (19 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active, * = Both
198.51.100.1/32 *[Static/5] 5d 21:02:26
> to 203.0.113.65 via ge-0/0/3.0
user@R2> show route 172.20.110.0/24
inet.0: 19 destinations, 19 routes (19 active, 0 holddown, 0 hidden)
Restart Complete
+ = Active Route, - = Last Active,
* = Both
172.20.110.0/24 *[Static/5] 10:43:01
> via gr-0/0/0.0
Referring to the exhibit, traffic destined to which network will be sent through the tunnel?
Answer: D
Explanation:
To determine which traffic is being sent through a tunnel in a Junos OS environment, an administrator must analyze the routing table output for the exit interface associated with each destination prefix. The provided exhibit shows the results of the show route command on routerR2for two specific destination networks.
In the first output, the destination198.51.100.1/32is an active static route. The next-hop information specifies that traffic for this address is sent to the gateway 203.0.113.65 via the interfacege-0/0/3.0. According to Juniper Networks interface naming conventions, the prefixge-denotes aGigabit Ethernetinterface, which represents a standard physical connection. Therefore, this traffic does not traverse a tunnel.
In the second output, the destination172.20.110.0/24is also an active static route. However, the next-hop for this network is listed asvia gr-0/0/0.0. In the Junos operating system, thegr-prefix explicitly identifies a Generic Routing Encapsulation (GRE) tunnel interface. GRE is a widely used protocol in service provider networks to encapsulate various network layer protocols over an IP backbone, effectively creating a virtual point-to-point link. Because the routing table has installed the route for 172.20.110.0/24 specifically via the gr- interface, all traffic destined for this network will be encapsulated and sent through the tunnel.
The other choices are incorrect for the following reasons:
* 203.0.113.65 (Option B):This is the next-hop IP address for the physical Gigabit Ethernet path; it is not a destination network directed to a tunnel.
* 0.0.0.0/0 (Option C):There is no information in the exhibit regarding a default route.
* 198.51.100.1/32 (Option D):As identified by thege-interface prefix in the exhibit, traffic for this destination is sent via a physical Ethernet link.
NEW QUESTION # 114
Which two steps are required to enable MPLS on a physical interface in Junos? (Choose two.)
Answer: A,D
Explanation:
To enable MPLS on a physical interface in Junos, the family mpls statement must be added to the interface configuration. Additionally, the interface itself must be specified under the protocols mpls section of the configuration.
NEW QUESTION # 115
Click the Exhibit button.
Referring to the exhibit, R1 and R2 are advertising the same prefix 203.0.113.0/24 to R3 and R4 over EBGP. R3 and R4 both advertise this prefix to R5.
Which advertisement does R5 choose to install in its routing table?
Answer: A
Explanation:
R3 and R4 both advertise the same prefix into iBGP toward R5, but they assign different local preference values. R3 sets a local preference of 150, while R4 sets a local preference of 200.
Since BGP selects routes with the highest local preference before considering other attributes, R5 chooses the route received from R4 and installs it in its routing table.
NEW QUESTION # 116
What prevents routing loops in a single-area OSPF network?
Answer: B
Explanation:
In OSPF, loop prevention within a single area is achieved through the fundamental nature of its link-state architecture. Unlike distance-vector protocols that rely on "routing by rumor," OSPF ensures that every router within an area maintains an identicalLink-State Database (LSDB). This database acts as a complete map of the network topology.
Once the LSDB is synchronized, each router independently executes theShortest Path First (SPF) algorithm
, which is formally known as theDijkstra algorithm. This mathematical process treats the local router as the
"root" of a tree and calculates the shortest path to every other node (router) and prefix in the area based on the cumulative interface costs. Because every router uses the same synchronized map (the LSDB) and the same deterministic algorithm, they all arrive at a consistent, loop-free view of the best paths.
According to Juniper Networks technical documentation, the Dijkstra algorithm is superior to theBellman- Ford algorithm(used by distance-vector protocols like RIP) in this regard. Bellman-Ford is susceptible to
"count-to-infinity" problems and loops because routers only know the distance and direction to a destination provided by their neighbors, rather than the full topology. In OSPF, even if a link fails, the updated Link-State Advertisement (LSA) is flooded rapidly, and the Dijkstra algorithm is re-run to find a new loop-free path.
Routing policies(Option B) are used to manipulate path selection or filter routes but are not the primary mechanism for fundamental loop prevention in OSPF. Similarly,forwarding policies(Option D) govern how traffic is handled at the data plane level rather than determining the control plane's loop-free topology.
NEW QUESTION # 117
Which two statements about the BGP path selection process are correct? (Choose two.)
Answer: B,C
NEW QUESTION # 118
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