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| Section | Objectives |
|---|---|
| Layer 2 Switching and VLANs | - Bridging components - Inter-VLAN routing - Native VLANs and voice VLANs - Frame processing - Ports and VLAN tagging |
| 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 |
| Protocol-Independent Routing | - Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups |
| Layer 2 Security | - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters - BPDU, loop and root protection |
| IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Spanning Tree | - STP and RSTP concepts, roles and states - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) |
| OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
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NEW QUESTION # 162
Which two multicast IP addresses are used for link-state update packets? (Choose two.)
Answer: C,D
NEW QUESTION # 163
Refer to Exhibit. Which two statements about the output shown in the exhibit are correct?
(Choose two.)
Answer: B,D
Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation -- no IIH PDUs are sent or expected on it -- but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false.
NEW QUESTION # 164
You are using tunnels in your network. It is important that the routes be specific enough to ensure that the tunnels are established. You need to prevent a route that is new to the network from being used. In this scenario, which type of route should be used?
Answer: D
NEW QUESTION # 165
Which statement is correct about IP-IP tunnels?
Answer: B
Explanation:
"The ENCAPSULATOR does not change the inner IP header, except to decrement the TTL and it remains unchanged during its deliver to the endpoint" - only router that encapsulates the inner packet decrements its TTL - during transit, the inner packet is unchanged.
NEW QUESTION # 166
You have configured an aggregate route for prefix 10.20.0.0/22 with three contributing routes:
10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24. A packet arrives destined to 10.20.3.100. In this scenario, which action does the router take?
Answer: D
Explanation:
The 10.20.0.0/22 aggregate covers the four /24 blocks 10.20.0.0/24 through 10.20.3.0/24, but only the first three of those (10.20.0.0/24, 10.20.1.0/24, and 10.20.2.0/24) are configured and present as active contributing routes; 10.20.3.0/24, the block containing the destination address
10.20.3.100, has no corresponding contributing route in this configuration. Because no more- specific route exists for 10.20.3.100, the longest-match lookup falls through the missing /24 and matches only the broader /22 aggregate itself. By default, when Junos installs an aggregate route, it assigns that route a reject next hop rather than any usable forwarding next hop; this is a deliberate design choice so that traffic destined for gaps within an advertised summary block -- gaps where no real, more- specific path actually exists -- is not blindly forwarded toward whatever next hop happens to belong to one of the unrelated contributing routes. A reject next hop causes the router to drop the packet and generate and return an ICMP destination-unreachable message to the originating source, explicitly informing it that no path exists, which is functionally and behaviorally distinct from a silent discard next hop that would drop the packet without any such notification. Aggregate routes never adopt or forward through any single contributing route's next hop, which rules out the two forwarding-based answer choices entirely.
NEW QUESTION # 167
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