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| Section | Objectives |
|---|---|
| Protocol-Independent Routing | - Martian addresses and RIB groups - Static, aggregate, generated routes - Load balancing and filter-based forwarding |
| BGP | - EBGP and IBGP peer interactions - BGP basic operations and message types - Attributes and path selection |
| 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) |
| Layer 2 Switching and VLANs | - Frame processing - Inter-VLAN routing - Bridging components - Native VLANs and voice VLANs - Ports and VLAN tagging |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
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NEW QUESTION # 155
An EBGP session sources its TCP connection from which IP address?
Answer: A
NEW QUESTION # 156
Which two statements describe OSPF DR and BDR behavior? (Choose two.)
Answer: B,C
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with every other router on the segment concurrently with the DR, precisely so that if the DR ever fails or is withdrawn, the BDR can be promoted directly to DR essentially instantaneously, without needing to wait through a fresh, full DR/BDR election process, and a new BDR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 # 157
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?
Answer: B
Explanation:
Nonstop active routing's defining architectural feature is that the backup Routing Engine runs a fully live, active instance of the routing protocol daemon (rpd) in parallel with the primary Routing Engine's rpd instance, continuously, from the moment NSR and its prerequisite GRES are established -- not merely at the instant a switchover begins. As protocol adjacencies form, routes are learned, and the RIB is updated on the primary Routing Engine, that same protocol and RIB state is mirrored in real time to the backup Routing Engine's rpd process through an internal synchronization mechanism, so the backup's protocol state remains a live, up-to-date replica of the primary's at essentially every moment during normal operation. When a switchover occurs, the backup Routing Engine simply assumes the primary role with protocol adjacencies, routing tables, and forwarding state already fully populated and current, allowing it to continue operating without re-establishing neighbor relationships or re-learning the network topology, which is what makes the switchover genuinely nonstop and invisible to neighboring routers. This is fundamentally different from graceful restart, where the restarting router must rebuild its state by requesting help from cooperating neighbors after the fact. The Packet Forwarding Engine plays no role in synchronizing protocol-layer information such as LSAs or BGP updates; that is strictly an rpd-to-rpd function coordinated through the Routing Engine synchronization infrastructure.
NEW QUESTION # 158
You manage the Layer 2 network shown in the exhibit. You experience a failure on the ge-0/0/0 link between Switch-1 and Switch-2.
Which statement is correct about the expected behavior?
Answer: A
NEW QUESTION # 159
Click the Exhibit button. An OSPF broadcast segment has four routers with roles as shown in the exhibit. R1 is currently offline, and default OSPF settings are in place.
In this scenario, what happens when R1 comes back online?
Answer: D
Explanation:
OSPF's Designated Router election, as defined in RFC 2328 and implemented unchanged in Junos, is explicitly non-preemptive. Router priority is used only at the moment an election actually takes place -- that is, when no DR or BDR currently exists on the segment. Once a DR and BDR have been elected and are functioning, a router with a numerically higher priority that joins the segment afterward does not trigger a new election and does not displace the incumbent DR or BDR, no matter how much higher its priority value is. In this scenario, R2 (priority 150) and R3 (priority 100) were already elected DR and BDR respectively while R1 was offline. When R1, whose priority of 200 would have made it the preferred DR had it been present during the original election, returns to the segment, it simply forms a full adjacency with the existing DR and BDR and takes on the DROther role like R4, without any re-election occurring. This design choice exists specifically to prevent unnecessary and disruptive Network LSA regeneration and adjacency churn every time a high-priority router reboots or rejoins a stable broadcast network.
The only ways R1 could become DR going forward are if the current DR fails (promoting the BDR to DR and triggering a new BDR election) or if the entire segment's OSPF process is restarted, forcing a fresh election from a clean state.
NEW QUESTION # 160
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