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| Section | Objectives |
|---|---|
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| High Availability | - Link Aggregation Groups and RTG - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
| Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control - BPDU, loop and root protection |
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Martian addresses and RIB groups - Static, aggregate, generated routes |
| OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
| Layer 2 Switching and VLANs | - Bridging components - Frame processing - Native VLANs and voice VLANs - Ports and VLAN tagging - Inter-VLAN routing |
| BGP | - Attributes and path selection - BGP basic operations and message types - EBGP and IBGP peer interactions |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
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NEW QUESTION # 86 
Click the Exhibit button.
You configure the aggregate route 172.16.0.0/16 on router R1. The routing table currently contains active routes for 172.16.10.0/24 and 172.16.99.0/24. No other more-specific routes exist.
Referring to the exhibit, which statement describes what R1 would do with traffic destined to 172.16.200.5?
Answer: A
Explanation:
The destination address 172.16.200.5 falls within the 172.16.0.0/16 aggregate's summarized range but does not fall within either of the two active, more-specific contributing routes actually present in the table -
172.16.10.0/24 and 172.16.99.0/24 - meaning no route more specific than the /16 itself exists to cover it.
Under Junos's longest-match forwarding logic, the lookup for 172.16.200.5 therefore resolves to the aggregate route itself, and since aggregate routes are installed by default with a reject next hop rather than any real forwarding path, the router drops the packet and simultaneously generates an ICMP destination-unreachable message back to the originating source, explicitly signaling that no valid path exists for that specific destination even though a covering summary is being advertised. This reject behavior is precisely why aggregate routes are valuable for reducing the number of routes advertised upstream while still providing clear, immediate feedback for traffic aimed at address space within the summary that has no genuine underlying route, rather than silently black-holing it or misdirecting it toward an unrelated contributing route's next hop. The aggregate route itself remains active and installed throughout this process - a gap in contributing coverage does not deactivate the aggregate, since the aggregate's activation depends only on at least one contributing route being active, which is satisfied here by both existing /24 blocks. There is also no default route present in this scenario to fall back upon. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Aggregate Route Reject Behavior for Uncovered Address Space.
NEW QUESTION # 87
Your company has a branch location that uses a Juniper Networks EX Series Switch. You are asked to troubleshoot a spanning-tree issue that keeps reoccurring within the branch environment. After investigation, you discover that end-devices running a virtualization application are generating BPDUs, which are disrupting the spanning-tree topology and causing periodic outages. Which solution will prevent this problem from reoccurring?
Answer: A
Explanation:
This scenario describes end hosts -- virtualization hosts running software switches or virtual bridging stacks -- unexpectedly generating and transmitting BPDUs on ports that are supposed to be pure edge (host-facing) ports where no BPDUs should ever legitimately be received. BPDU protection (BPDU guard) is the Junos feature purpose-built for exactly this situation: when applied to an edge- designated interface, it continuously monitors that port for any incoming BPDU, and the moment one is detected, it immediately and automatically disables the port, preventing the unexpected BPDU source from ever participating in or influencing the spanning-tree topology calculation, thereby protecting the stable, intended topology from disruption caused by unauthorized or accidental BPDU generation at the access edge. This directly and precisely resolves the described problem at its source, since the root cause is illegitimate BPDUs arriving on ports that were never meant to see them. Increasing the max-age timer only adjusts how long stale topology information is retained before being aged out and has no effect on preventing rogue BPDUs from being processed in the first place. Disabling RSTP outright on access interfaces would eliminate spanning tree's loop- prevention protection on those ports entirely, introducing a much more severe risk of undetected Layer 2 loops. Root protection (root guard) defends specifically against a port attempting to become the root port by receiving a superior BPDU claiming a better path to root; it addresses a different threat model than blocking any BPDU outright on a true edge port.
NEW QUESTION # 88 
You need to apply a Layer 2 firewall filter on a Juniper Networks EX Series Switch to block traffic from the source MAC address 00:12:34:56:00:07 entering the switch on ge-0/0/3. After committing the configuration, traffic from the MAC address still passes through.
Referring to the exhibit, which statement is correct in this scenario?
Answer: D
Explanation:
The intent of this filter is to match and discard traffic from one single, specific host MAC address, which requires the source-mac-address match condition to reference the complete, exact 48-bit address using an explicit /48 mask (or no mask at all, which Junos treats as an implicit full match) so that only that one precise address is matched. As configured, the term instead specifies a /40 mask on 00:12:34:56:00:07, meaning only the first 40 bits (the first five octets, 00:12:34:56:00) are actually significant to the match, while the sixth octet is effectively wildcarded across its full range; this produces an imprecise, overly broad match criterion rather than the single-host match the administrator intended, and is a common configuration mistake that undermines the predictability and correctness of MAC-based filtering. The lesson tested here is that source and destination MAC address match conditions in Junos firewall filters must be specified with the correct, deliberate, and explicit prefix length appropriate to the intended scope - typically /48 for a single exact host
- rather than an arbitrary or miscalculated mask value. Firewall filters under family ethernet-switching are fully capable of matching on both source-mac-address and destination-mac-address, which rules out that option entirely. Layer 2 MAC-based filters function correctly on both access and trunk interface modes, so interface type is not a limiting factor here. There is no indication in the exhibit that the filter's application direction (input versus output) is reversed. Reference topics: Junos Enterprise Switching - Layer 2 Security, MAC Address Match Conditions and Prefix Length Precision.
NEW QUESTION # 89
Which statement is correct about the configuration shown in the exhibit?
Answer: D
NEW QUESTION # 90
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network. What two statements are correct in this scenario? (Choose two.)
Answer: A,C
Explanation:
The rules are as simple as follows:
1. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
2. EBGP peers advertise routes learned from IBGP or EBGP peers to other EBGP peers.
https://community.juniper.net/discussion/understanding-how-ibgpebgp-behaves-in-junos
NEW QUESTION # 91
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