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| Section | Objectives |
|---|---|
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Layer 2 Switching and VLANs | - Bridging components - Native VLANs and voice VLANs - Frame processing - Ports and VLAN tagging - Inter-VLAN routing |
| OSPF | - Areas and LSA types - Link-state database and packet types - Router ID, adjacencies and neighbors |
| Layer 2 Security | - Layer 2 firewall filters - BPDU, loop and root protection - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control |
| 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 |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence - STP and RSTP concepts, roles and states |
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
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NEW QUESTION # 46 
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: C
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. Reference topics:
Junos Enterprise Routing - OSPF, Designated Router Election and Non-Preemption.
NEW QUESTION # 47
Which two statements about MACsec are true? (Choose two.)
Answer: A,D
NEW QUESTION # 48
Referring to the exhibit, why is the route for 10.5.5.5 hidden?
Answer: D
NEW QUESTION # 49
A host connected to interface ge-0/0/3 on your Juniper Networks EX Series Switch cannot reach another device in the same VLAN. The administrator wants to confirm that the switch has learned the MAC address of the host. Which command should be used to accomplish this task?
Answer: A
Explanation:
The show ethernet-switching table command displays the Layer 2 forwarding database (the bridge or MAC table) that an EX Series switch builds dynamically by inspecting the source MAC address of every frame it receives. Each entry records the learned MAC address, the VLAN it was learned on, the type of entry (dynamic, static, or persistent), and the specific interface through which that address was seen, which is precisely the information needed to confirm whether the switch has learned the host connected to ge-0/0/3. If the host's MAC address is absent from the table, that immediately points to a Layer 1/2 issue -- no frames have been received from the host, a cabling or port problem exists, or the interface is administratively down or blocked by spanning tree -- rather than a Layer 3 routing or VLAN membership problem. show interfaces terse only reports administrative and link state along with any assigned protocol family addresses, offering no MAC-learning visibility. show vlans lists VLAN definitions and their member interfaces but does not display learned host addresses. show interfaces extensive provides detailed physical-layer counters and error statistics, useful for diagnosing frame loss or interface errors, but it does not expose the switching table. For intra-VLAN reachability troubleshooting, verifying MAC learning is always the first and most direct Layer 2 checkpoint.
NEW QUESTION # 50
Referring to the exhibit, which policy will export routes to IBGP peers?
Answer: D
NEW QUESTION # 51
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