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| Section | Objectives |
|---|---|
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| OSPF | - Areas and LSA types - Link-state database and packet types - Router ID, adjacencies and neighbors |
| Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Bridging components - Frame processing - Ports and VLAN tagging - Inter-VLAN routing |
| Layer 2 Security | - Layer 2 firewall filters - MACsec and storm control - BPDU, loop and root protection - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
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NEW QUESTION # 97 
Click the Exhibit button.
You want the RSTP primary root path from switch C to traverse switch B.
Referring to the exhibit, which solution will accomplish this task?
Answer: A
Explanation:
Switch A is already fixed as the root bridge in this topology (priority 0), so the outcome being engineered here is not about root bridge election at all, but about which of Switch C's two available paths toward that already- established root - the direct C-to-A link, or the indirect C-to-B-to-A path - RSTP selects as the lower-cost, primary path. RSTP's path-cost calculation for any non-root switch sums the port costs of every link along a candidate path to the root and always selects whichever candidate path has the lowest total accumulated cost as that switch's active root path, placing the corresponding local port into the forwarding root port role while any higher-cost alternative path is placed into a non-forwarding (alternate) role. To force Switch C to prefer routing through Switch B rather than connecting to Switch A directly, the administrator must make the direct C-to-A link's cost higher than the combined cost of the C-to-B link plus the B-to-A link added together, so that the indirect, two-hop path through Switch B mathematically totals to a lower cumulative cost than the single direct hop, causing RSTP's cost comparison to favor the indirect path as primary. Setting Switch B's priority (to either 1 or 0) is irrelevant here, since Switch B is not a root bridge candidate in this scenario and priority manipulation would only affect a root bridge election, not path cost preference between a fixed root and a downstream switch. Lowering the direct link's cost, the inverse of the correct answer, would instead reinforce the direct path rather than override it. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, RSTP Path Cost and Root Port Selection.
NEW QUESTION # 98
Which two statements describe OSPF DR and BDR behavior? (Choose two.)
Answer: B,D
Explanation:
The Backup Designated Router exists specifically to provide immediate failover redundancy for the Designated Router role on a multi-access broadcast or NBMA segment: the BDR maintains full adjacencies with every other router on the segment concurrently with the DR, precisely so that if the DR ever fails or is withdrawn, the BDR can be promoted directly to DR essentially instantaneously, without needing to wait through a fresh, full DR/BDR election process, and a new BDR election then takes place separately among the remaining DROther routers to fill the now-vacant backup role. This immediate promotion behavior confirms the first statement as correct. The Designated Router's other core responsibility on the segment is originating the Type
2 Network LSA, which describes the multi-access network itself as a pseudonode, listing every router attached to that segment; this LSA type exists specifically to avoid the full-mesh explosion of Router LSA adjacency listings that would otherwise be needed to describe a shared broadcast segment, and only the DR -- never the BDR, and never any DROther -- is responsible for generating and maintaining this particular LSA under normal, stable conditions, which confirms the third statement while directly ruling out the fourth. There is no such thing as the DR 'electing' an area border router; ABR status is instead a role a router acquires organically by having interfaces in more than one OSPF area, entirely independent of any DR/BDR election process on any individual segment.
NEW QUESTION # 99
Referring to the output shown in the exhibit, which statement is correct?
Answer: A
Explanation:
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network. These neighbors are often referred to as "DRothers". Therefore, option B is correct.
NEW QUESTION # 100
Referring to the exhibit, which router will become the OSPF BDR if all routers are powered on at the same time?
Answer: C
Explanation:
Priority set to 0 will never become DR or BDR so R1 is excluded.
Higher priority is better in OSPF so R2 is lowest than both R3 and R4.
R3 and R4 has the same priority so RID will decide.
R4 has the highest RID so it will become DR and R3 will then become BDR.
NEW QUESTION # 101
Which two statements correctly describe RSTP port roles? (Choose two.)
Answer: A,C
Explanation:
An RSTP topology contains ports that have specific roles:
The root port is responsible for forwarding data to the root bridge.
The alternate port is a standby port for the root port. When a root port goes down, the alternate port becomes the active root port.
The designated port forwards data to the downstream network segment or device.
The backup port is a backup port for the designated port. When a designated port goes down, the backup port becomes the active designated port and starts forwarding data.
NEW QUESTION # 102
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