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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Routing tables, static routes and route preference - Basic routing policy and filter operation |
| Topic 2: Tunnels and Overlays | 5-10% | - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration - Tunnel types, encapsulation and operation |
| Topic 3: Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration |
| Topic 4: OSPF | 15-20% | - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting - Route summarization and redistribution |
| Topic 5: IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
| Topic 6: Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control |
| Topic 7: BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| Topic 8: IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics - Configuration and route exchange |
| Topic 9: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing |
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NEW QUESTION # 12
What is the default hello interval on an OSPF interface?
Answer: C
NEW QUESTION # 13
Which two characteristics describe the default behavior of aggregate routes? (Choose two.)
Answer: B,C
Explanation:
The entire purpose of route aggregation is summarization - replacing a set of more-specific contributing routes with a single, broader prefix advertised outward - and this summarization inherently hides internal routing instability from external peers: if one of the underlying contributing /24 blocks within a summarized
/16 flaps up and down due to a local link issue, external peers who only see the stable, unchanging /16 aggregate are completely insulated from that churn, since the aggregate itself remains active and advertised as long as at least one contributing route is present, regardless of how much internal fluctuation occurs among the individual contributors. This stability-hiding characteristic is one of the primary operational benefits that motivates using aggregate routes in the first place, confirming that statement as correct. Regarding next-hop behavior, official Juniper documentation is explicit and unambiguous: when an aggregate route is installed in the routing table, Junos assigns it a reject next hop by default, meaning traffic matching only the aggregate (and no more-specific contributor) is dropped and an ICMP unreachable message is returned to the source; a discard next hop is available only as an optional, explicitly configured alternative when silent dropping without ICMP notification is preferred, but it is not the default. Aggregate routes categorically do not advertise their individual contributing routes; suppressing those specific, more-granular prefixes from onward advertisement in favor of the single summary is the aggregate's defining function, directly contradicting the first statement. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Default Reject Next Hop and Route Summarization Benefits.
NEW QUESTION # 14
Your ISP is announcing a default route to both R1 and R2. You want your network routers to forward all Internet traffic through the R1 device.
Which BGP attribute would you use?
Answer: D
Explanation:
The BGP attribute that you would use to forward all Internet traffic through the R1 device is the local preference.
The local preference is an attribute that is used within an autonomous system (AS) and exchanged between iBGP routers. It is used to select an exit point from the AS. The path with the highest local preference is preferred. By setting a higher local preference for the routes received from R1, you can make R1 the preferred exit point for all Internet traffic.
NEW QUESTION # 15 
Click the Exhibit button.
You have two routers on your network that are not able to establish BGP sessions.
Which two statements are correct in this scenario? (Choose two.)
Answer: A,B
Explanation:
The diagnostic output explicitly states the root cause: the local router has only the inet6-unicast address family configured for this peer, while the remote router advertised inet-unicast and inet-vpn-unicast in its OPEN message, and BGP requires at least one common negotiated address family (NLRI type) between two peers for a session to remain established; with zero overlap between the two sides' configured families, the session is torn down immediately after the OPEN exchange, which is precisely why the peer state shows Active rather than Established. This confirms the mismatched-address-family statement directly and unambiguously from the exhibit's own Down reason and Detail reason fields. The diagnostic tool's own embedded Suggestion text goes further, explicitly advising the administrator to additionally verify that the local-address configured for the peer matches the remote router's configured neighbor address and vice versa - a secondary, commonly encountered condition in which mismatched or effectively duplicated/incorrect address bindings between the two sides' neighbor statements can independently prevent a session from completing correctly, even once the family mismatch is resolved. This is why address-configuration consistency between the peers is flagged as a second concern worth checking in this scenario. Nothing in the exhibit references NTP or time synchronization at all, nor does anything in the output reference authentication, an MD5 mismatch, or any related failure signature; both of those conditions would present through entirely different diagnostic messages than the one shown here. Reference topics: Junos Enterprise Routing - BGP, Address Family Negotiation and the show bgp diagnostics neighbor Command.
NEW QUESTION # 16
What are two characteristics of IS-IS? (Choose two.)
Answer: B,C
Explanation:
IS-IS (Intermediate System to Intermediate System) was designed by ISO as a link-state Interior Gateway Protocol for routing within a single autonomous system, functioning on a hierarchical two-level model conceptually similar to OSPF's areas, which makes the first statement unambiguously correct. Within that hierarchy, Level 1 routers maintain detailed topology information only for their own local area and use a default route toward the nearest Level 2 or Level 1/Level 2 router to reach destinations outside the area; they explicitly do not carry inter-area topology information and therefore cannot route traffic between areas on their own. Routers that participate in both levels simultaneously -- Level 1/Level 2 (L1/L2) routers -- sit at the area boundary, maintaining a Level 1 database for their local area and a Level 2 database for the backbone, and it is specifically these dual- level routers that stitch inter-area traffic together, forwarding packets from the local area into the Level 2 backbone and vice versa, which confirms the second correct statement. Regarding route preference, Junos assigns distinct default preference (administrative distance) values of 15 for IS-IS Level 1 routes and 18 for IS-IS Level 2 routes -- neither of which is 20 -- so the preference-value statement is factually incorrect and included as a distractor testing precise knowledge of Junos default protocol preferences.
NEW QUESTION # 17
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