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| Section | Objectives |
|---|---|
| Protocol-Independent Routing | - Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| OSPF | - Link-state database and packet types - Router ID, adjacencies and neighbors - Areas and LSA types |
| Layer 2 Security | - BPDU, loop and root protection - Layer 2 firewall filters - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Native VLANs and voice VLANs - Frame processing - Bridging components - Ports and VLAN tagging |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence - STP and RSTP concepts, roles and states |
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NEW QUESTION # 209
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?
Answer: A
Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN. The DR election process is based on the following criteria, in order of precedence:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a
32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface. If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR. In your scenario, two routers share the same highest priority and start time.
This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails.
NEW QUESTION # 210
Click the Exhibit button. A network includes several autonomous systems that exchange routing information using BGP. Multiple BGP routes exist for the same prefix. Referring to the exhibit, which attribute would BGP use first when selecting a preferred route?
Answer: D
Explanation:
The Junos BGP path selection algorithm proceeds through a strict, ordered sequence of comparison steps, and once next-hop reachability and route preference (administrative distance) have been confirmed as equal, local preference is the very first BGP-specific path attribute evaluated in the decision process. A route carrying a higher local preference value is always chosen over a competing route to the same prefix with a lower local preference, and this comparison takes absolute precedence over every subsequent attribute in the algorithm; if local preference values differ between candidate paths, the selection process concludes at this step without ever needing to examine AS path length, origin type, or MED at all. Only when two or more competing paths share an identical local preference value does the algorithm proceed to its third step, comparing AS path length and preferring the shortest, and only after a further tie does it move on to origin type (preferring IGP-origin over EGP-origin, and EGP-origin over incomplete), followed by MED comparison (preferring the lowest value, and only among routes learned from the same neighboring AS by default). Because local preference is evaluated strictly before all three of the other listed attributes, it is the attribute BGP consults first among the choices given, making it the deciding factor in scenarios such as this exhibit where multiple autonomous systems advertise competing paths toward the same 192.168.1.0/24 prefix.
NEW QUESTION # 211
You need to block SSH (TCP port 22) traffic from the 192.168.10.0/24 network.
Which firewall filter term is correct in this scenario?
Answer: D
NEW QUESTION # 212
You are deploying a trunk port with multiple VLANs. In this scenario, which statement is true about the native VLAN?
Answer: D
NEW QUESTION # 213
What are two reasons for creating multiple areas in OSPF? (Choose two.)
Answer: C,D
Explanation:
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time .
This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.
Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.
NEW QUESTION # 214
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