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| Section | Weight | Objectives |
|---|---|---|
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control |
| BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| OSPF | 15-20% | - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting - Route summarization and redistribution |
| IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting - Configuration and route exchange |
| IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
| High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting |
| Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing tables, static routes and route preference - Routing instances and route selection criteria |
| Layer 2 Switching and VLANs | 15-20% | - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis |
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NEW QUESTION # 36
You want to use filter-based forwarding (FBF) to forward traffic sourced from subnet 10.0.0.0/24 to a specific destination.
Which two routing instance types would enable you to accomplish this task? (Choose two.)
Answer: A,D
NEW QUESTION # 37
You are establishing a new BGP session to an EBGP peer using loopback addresses. In addition to your general EBGP settings, which BGP feature must be enabled for this session to establish?
Answer: B
Explanation:
By default, EBGP sessions are built with the expectation that peers are directly connected at Layer 3, and Junos enforces this by sending EBGP packets with a TTL of 1. When loopback addresses are used as the session endpoints instead of the directly connected physical interface addresses, the resulting IP packets must traverse at least one additional router hop between the two loopbacks, and a TTL of 1 will expire in transit before reaching the remote loopback, causing the TCP handshake -- and therefore the BGP session -- to fail even though a valid route to the peer's loopback exists. The multihop statement (configured as an EBGP multihop parameter with an accompanying TTL value, most commonly set to 2 for a single intermediate hop) instructs Junos to increase the TTL used for that peer's BGP packets so they survive the extra hop count between loopbacks. This is a mandatory addition any time an EBGP session is deliberately built against non-directly-connected addresses, whereas IBGP sessions, by contrast, do not have this default restriction because IBGP already assumes peers may be multiple hops apart within the same AS. Multipath affects load-balancing across equal-cost paths, damping suppresses flapping routes, and passive controls whether a router waits for the remote peer to initiate the TCP connection -- none of these resolve the TTL expiration problem inherent to loopback-based EBGP peering.
NEW QUESTION # 38
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: C
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. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Default Reject Next Hop for Aggregate Routes.
NEW QUESTION # 39
Which statement concerning Bidirectional Forwarding Detection (BFD) is true for the configuration shown in the exhibit?
Answer: B
NEW QUESTION # 40
Refer to Exhibit:
R1 is not responding to ICMP requests sent to the VIP address.
Referring to the exhibit, which command option would you configure on the virtual address to correct this problem?
Answer: C
Explanation:
In this configuration, R1's physical interface address (10.10.10.1) is different from the VRRP virtual IP address (10.100.100.1), meaning R1 is operating as a non-owner VRRP master -- it did not originate the virtual address as one of its own real interface addresses. By default, Junos VRRP masters that do not own the virtual address will forward transit traffic destined through that address but will not process or respond to traffic addressed directly to the VIP itself, such as ICMP echo requests, Telnet, or SSH sessions aimed at 10.100.100.1. This is deliberate default behavior intended to prevent ambiguity about which physical device is answering on behalf of a shared virtual identity. To allow the master to accept and respond to packets whose destination is the virtual address itself, the accept-data statement must be explicitly configured under the vrrp- group hierarchy. Once enabled, the elected master will process locally destined traffic sent to the VIP, resolving exactly the symptom described. The track option is used for interface or route- based priority adjustment to influence mastership, advertise-interval tunes the frequency of VRRP hello advertisements, and no-preempt prevents a higher-priority router from reclaiming mastership once a lower-priority router has taken over -- none of these affect whether the master processes traffic destined to the VIP.
NEW QUESTION # 41
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