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| Section | Objectives |
|---|---|
| High Availability | - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart - Link Aggregation Groups and RTG |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| OSPF | - Areas and LSA types - Router ID, adjacencies and neighbors - Link-state database and packet types |
| BGP | - Attributes and path selection - BGP basic operations and message types - EBGP and IBGP peer interactions |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Bridging components - Frame processing - Ports and VLAN tagging - Native VLANs and voice VLANs |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - BPDU, loop and root protection |
| IS-IS | - Adjacencies and troubleshooting - Link-state database and PDUs - Levels, areas and metrics |
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NEW QUESTION # 149
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
Answer: B,D
Explanation:
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention. There are four categories of BGP attributes:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates.
Optional transitive: May not be supported by all implementations of BGP.
Optional non-transitive: May not be supported by all implementations of BGP. The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update. These include the AS path and next hop attributes.
NEW QUESTION # 150
Which two statements about MACsec are true? (Choose two.)
Answer: A,B
NEW QUESTION # 151
Click the Exhibit button. You run the show ospf database command and you see a Router LSA marked with an asterisk.
Referring to the exhibit, what is the significance of this result?
Answer: D
Explanation:
In the output of show ospf database, Junos marks every self-originated link-state advertisement with an asterisk immediately preceding the LSA's link-state ID. A self-originated LSA is one that was created and flooded by the router on which the command is being executed, as opposed to an LSA that was received from and originated by a neighboring router elsewhere in the area. In this exhibit, the asterisked Router LSA has an ID of 10.101.100.0 and an Advertising Router value of the same 10.101.100.0, confirming that this particular Router LSA describes the local device's own links, area membership, and interface costs, and that the local router itself flooded this LSA into the area's link- state database. This distinction matters operationally because when troubleshooting OSPF topology or SPF calculation issues, engineers frequently need to isolate their own router's advertised state from the states advertised by every other router in the area; the asterisk provides an immediate, unambiguous visual cue for that separation without needing to cross-reference the router's own ID separately. It has no relationship to designated router or backup designated router status -- DR/BDR roles are indicated elsewhere in interface-level output, not through the asterisk convention in the LSA database dump, and a router that is neither DR nor BDR still self-originates and flags its own Router LSA the same way.
NEW QUESTION # 152
Which two statements are correct about generated routes? (Choose two.)
Answer: A,D
Explanation:
A is correct because generated routes require a contributing route. A contributing route is a route that matches the destination prefix of the generated route and has a valid next hop. A generated route is only installed in the routing table if there is at least one contributing route available. This ensures that the generated route is reachable and useful. If there is no contributing route, the generated route is not added to the routing table.
B is correct because generated routes show a next hop in the routing table. A generated route inherits the next hop of its primary contributing route, which is the most preferred route among all the contributing routes. The next hop of the generated route can be either an IP address or an interface name, depending on the type of the contributing route. The next hop of the generated route can also be modified by a routing policy.
NEW QUESTION # 153
Which two statements about BGP facilitate the prevention of routing loops within an autonomous system? (Choose two.)
Answer: B,D
NEW QUESTION # 154
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