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| Section | Objectives |
|---|---|
| Topic 1: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Topic 2: Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| Topic 3: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 4: Routing Protocols | - IS-IS overview - BGP fundamentals and policy control - OSPF configuration and troubleshooting |
| Topic 5: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 6: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
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NEW QUESTION # 110
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: C
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.
NEW QUESTION # 111
Referring to the output shown in the exhibit, which statement is correct?
Answer: A
Explanation:
In OSPF, the state of the neighbor relationship is determined by the exchange of OSPF packets between routers. The state "2Way" as shown in the exhibit indicates that bi-directional communication has been established between the two OSPF routers. This is the normal state for a neighbor that is not the Designated Router (DR) or Backup Designated Router (BDR) on a broadcast, non-broadcast multi-access (NBMA), or point-to-multipoint network. These neighbors are often referred to as "DRothers". Therefore, option B is correct.
NEW QUESTION # 112
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
Explanation:
Correctly blocking SSH traffic originating from a specific network requires matching three precise conditions simultaneously in the from clause: the traffic's source-address must equal the 192.168.10.0/24 network, since the requirement is to block traffic coming from that network rather than traffic destined to it; the protocol must be explicitly set to tcp, since SSH operates exclusively over TCP; and the destination-port must be set to
22, because an inbound SSH connection request is always directed at the well-known SSH listening port 22 on the receiving side, regardless of which ephemeral source port the initiating client happens to use. The first option satisfies all three conditions correctly and pairs them with a discard action, cleanly dropping matching traffic. The second option incorrectly substitutes destination-address for source-address, which would match traffic heading toward that /24 rather than traffic originating from it, inverting the intended match direction.
The third option incorrectly uses source-port 22 instead of destination-port 22; since the SSH client's source port is a randomly assigned ephemeral value rather than a fixed 22, this term would almost never match real SSH session-initiation traffic. The fourth option relies on a service ssh match condition, which is not valid syntax within the standard Junos firewall filter grammar for family inet; there is no such application-based keyword available at that hierarchy, making the term invalid regardless of the reject action chosen. Reference topics: Junos Enterprise Switching - Firewall Filters, Matching on Address, Protocol, and Port Conditions.
NEW QUESTION # 113
Referring to the exhibit, which three statements are correct? (Choose three.)
Answer: A,B,D
Explanation:
The IP source guard is enabled.
The configuration shows that ip-source-guardis explicitly enabled under dhcp-security.
Dynamic ARP inspection is enabled.
The configuration also includes arp-inspectionunder dhcp-security, which indicates that Dynamic ARP Inspection (DAI) is enabled.
DHCP snooping is enabled.
DHCP snooping is implied as enabled because both IP source guard and ARP inspection are dependent on the DHCP snooping database to function properly. Even though DHCP snooping is not explicitly mentioned, its presence is required for these features to work.
NEW QUESTION # 114
Which statement describes how nonstop active routing (NSR) maintains routing protocol information during a Routing Engine switchover?
Answer: D
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 # 115
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