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| Section | Weight | Objectives |
|---|---|---|
| Border Gateway Protocol (BGP) | 20-25% | - Policy and route filtering - IBGP and EBGP - Path selection and attributes - Configuration and troubleshooting - Basic operation and message types |
| Layer 2 Bridging and VLANs | 8-12% | - Service provider switching features - Bridging concepts - VLANs and trunking |
| Open Shortest Path First (OSPF) | 15-20% | - Link-state database - Areas and router types - LSA types and operation - Configuration and troubleshooting |
| High Availability | 5-8% | - Graceful restart - Nonstop active routing - NSR and GRES concepts |
| Multiprotocol Label Switching (MPLS) | 12-18% | - LDP and RSVP - Terminology and forwarding - Segment routing basics - Configuration and monitoring - Labels and LIB |
| Tunnels | 5-8% | - Tunnel configuration and usage - GRE and IP-IP tunnels |
| Spanning Tree Protocols | 8-12% | - STP, RSTP, MSTP, VSTP - Port roles and states - BPDU and protection features - Configuration and convergence |
| Protocol-Independent Routing | 10-15% | - Routing instances and RIB groups - Load balancing - Martian addresses - Filter-based forwarding - Static, aggregate, and generated routes |
| IPv6 | 8-12% | - OSPFv3 and BGP for IPv6 - Address types and format - Autoconfiguration - Static and dynamic routing |
| Intermediate System to Intermediate System (IS-IS) | 10-15% | - PDUs and TLVs - Adjacencies and levels - Metrics and wide metrics - Configuration and monitoring |
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NEW QUESTION # 154
By default, which MPLS operation is performed by the penultimate router in an LSP on the transport label?
Answer: D
Explanation:
In a Multiprotocol Label Switching (MPLS) environment, label operations are categorized into three primary actions:Push(adding a label),Swap(replacing a label), andPop(removing a label). The specific behavior described in the question refers to a mechanism calledPenultimate Hop Popping (PHP).
According to Juniper Networks technical documentation, the goal of PHP is to improve forwarding efficiency at the egress point of a Label-Switched Path (LSP). TheEgress Label Edge Router (LER), which is the final destination for the LSP, would normally have to perform two lookups if it received a labeled packet: first, it would look up the label in its MPLS table to see it is the destination, and second, it would look up the underlying IP payload in its IP routing table (inet.0) to forward the packet.
To alleviate this burden, the Egress LER signals a special label value calledImplicit Null (Label 3)to its upstream neighbor (the penultimate router) during the signaling process (RSVP or LDP). When the penultimate routerreceives a packet destined for that egress LER, it sees the instruction to pop the transport label. Consequently, the penultimate router performs aPopoperation, stripping away the outer MPLS label and sending the raw IP packet (or the remaining inner service label) to the Egress LER.
This allows the Egress LER to perform only a single lookup. If the transport label was the only label, the Egress LER simply performs a standard IP lookup. If there is a VPN label remaining, it performs a single MPLS lookup for the VRF. This "default" behavior in Junos OS optimizes the performance of the egress router by offloading the final label removal to the penultimate hop. Note that ifUltimate Hop Popping (UHP) were configured (via the explicit-null command), the penultimate router would perform aSwapto Label 0 instead of a Pop.
NEW QUESTION # 155
Which IS-IS packet type will establish and maintain neighbor relationships?
Answer: C
Explanation:
In theIS-IS (Intermediate System to Intermediate System)protocol, communication between routers is performed usingProtocol Data Units (PDUs). To discover neighbors and maintain adjacencies, IS-IS relies on theHello PDU (IIH - IS-IS Hello).
According to Juniper Networks technical documentation, when IS-IS is enabled on an interface, the router begins transmitting Hello PDUs to a multi-destination address (multicast). These PDUs contain essential information such as the router'sSystem ID, its configuredArea Addresses, and itsLevel capability(Level 1, Level 2, or both). For two routers to become neighbors, they must exchange these Hello PDUs and agree on specific parameters, such as the MTU of the link and the hello/hold timers.
Once an adjacency is established, the Hello PDU serves as a "keepalive" mechanism. If a router stops receiving Hello PDUs from a neighbor for a duration exceeding theHolding Time, it assumes the neighbor is down and flushes the associated Link-State PDUs (LSPs) from its database.
To clarify the other options:
* Link-State PDU (Option A):These are used to distribute actual topology and reachability information, not to form adjacencies.
* Partial Sequence Number PDU (Option C):PSNPs are used on point-to-point links to acknowledge the receipt of LSPs or to request missing LSPs.
* Update PDU (Option D):This is not a standard IS-IS term; in IS-IS, updates are handled via the flooding of LSPs.
NEW QUESTION # 156
What is the default route preference for an aggregate route?
Answer: C
Explanation:
In the Junos OS architecture,route preference(often referred to as administrative distance in other vendor platforms) is the primary metric used by the Routing Engine to select the "best" path when multiple protocols provide a route to the same destination. Each routing protocol and route type is assigned a default numeric value; the lower the value, the more preferred the route.
According to Juniper Networks technical documentation, anaggregate routeis assigned a default preference of
130. Aggregate routes are a form of static-like route used to group specific routes into a single, broader prefix to reduce the size of routing tables and limit the scope of routing updates. They are "protocol-independent" because they are not learned from a dynamic neighbor but are manually defined by the administrator.
To understand where130fits in the hierarchy, it is helpful to compare it with other common Junos preferences:
* Directly connected interfaces:0
* Static routes:5
* OSPF Internal:10
* IS-IS Level 1/2:15/18
* Aggregate routes: 130
* OSPF AS External:150
* BGP (Internal and External):170
* Generated routes:150
By setting the aggregate route preference to 130, Junos ensures that specific routes learned via IGPs (like OSPF or IS-IS) are preferred over the aggregate. This is essential because an aggregate route is often used as a
"catch-all" or a discard route when more specific path information is missing. If the aggregate had a lower preference (like 5), it might override dynamic routing information, leading to suboptimal routing or black- holed traffic.
NEW QUESTION # 157
Which new field is added to an IPv6 header as compared to IPv4?
Answer: C
Explanation:
The IPv6 header includes a new field that is not found in the IPv4 header, called the flow label.
The flow label in IPv6 is used to identify packets that require special handling by routers for quality of service (QoS) or other reasons, allowing these packets to be handled efficiently as they move through the network.
NEW QUESTION # 158
Which IPv6 extension header is used to specify intermediate nodes for a packet's path?
Answer: B
Explanation:
The IPv6 Routing extension header is used to specify intermediate nodes that a packet must traverse before reaching its final destination. It allows the sender to define a list of routers that the packet should pass through, enabling source routing functionality in IPv6.
NEW QUESTION # 159
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