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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Protocol-Independent Routing | 10-15% | - Martian addresses - Filter-based forwarding - Load balancing - Static, aggregate, and generated routes - Routing instances and RIB groups |
| Topic 2: IPv6 | 8-12% | - Autoconfiguration - Static and dynamic routing - OSPFv3 and BGP for IPv6 - Address types and format |
| Topic 3: Border Gateway Protocol (BGP) | 20-25% | - Policy and route filtering - Basic operation and message types - Path selection and attributes - IBGP and EBGP - Configuration and troubleshooting |
| Topic 4: Layer 2 Bridging and VLANs | 8-12% | - Bridging concepts - Service provider switching features - VLANs and trunking |
| Topic 5: Spanning Tree Protocols | 8-12% | - BPDU and protection features - Configuration and convergence - STP, RSTP, MSTP, VSTP - Port roles and states |
| Topic 6: Tunnels | 5-8% | - GRE and IP-IP tunnels - Tunnel configuration and usage |
| Topic 7: Open Shortest Path First (OSPF) | 15-20% | - Areas and router types - Link-state database - LSA types and operation - Configuration and troubleshooting |
| Topic 8: High Availability | 5-8% | - Nonstop active routing - NSR and GRES concepts - Graceful restart |
| Topic 9: Multiprotocol Label Switching (MPLS) | 12-18% | - Labels and LIB - LDP and RSVP - Terminology and forwarding - Configuration and monitoring - Segment routing basics |
| Topic 10: Intermediate System to Intermediate System (IS-IS) | 10-15% | - Metrics and wide metrics - PDUs and TLVs - Adjacencies and levels - Configuration and monitoring |
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NEW QUESTION # 166
You have configured an MPLS LSP that begins on R1 and terminates on R5 using the Junos default settings.
Referring to the exhibit, which router will perform only label swap operations?
Answer: C
Explanation:
In an MPLS network, routers are categorized by their role along a Label Switched Path (LSP). In this scenario, the LSP originates onR1 (Ingress LER)and terminates onR5 (Egress LER). Between these two endpoints are the Provider (P) routers, also known as Transit Label Switching Routers (LSRs), which include R2, R3, and R4.
To identify which router performsonlylabel swap operations, we must look at the standard Junos data plane behavior:
* R1 (Ingress LER):Performs aPushoperation. It receives native IP traffic from Networks 1 or 2, looks up the destination, and imposes (pushes) an MPLS label onto the packet before sending it to R2.
* R2 and R3 (Transit LSRs):These routers perform aSwapoperation. They receive a labeled packet, look up the incoming label in their Label Forwarding Information Base (LFIB), replace it with an outgoing label provided by the downstream neighbor, and forward it.
* R4 (Penultimate Hop):By default, Junos usesPenultimate Hop Popping (PHP). Because R4 is the second-to-last router before the egress (R5), the egress router R5 advertises an "implicit-null" label (Label 3) to R4. This instructs R4 to perform aPopoperation-removing the MPLS label entirely-and sending the native IP packet to R5.
* R5 (Egress LER):Receives the packet (which is already unlabeled due to PHP) and performs a standard IP route lookup to reach the final destination in Network 3 or 4.
Among the options provided,R3is the only router that is a transit LSR butnotthe penultimate hop. While R2 also performs a swap, it is not an option. R4 performs a Pop (due to PHP), R1 performs a Push, and R5 performs an IP lookup. Therefore, R3 is the correct answer as it solely performs the label swap operation.
NEW QUESTION # 167
What are two types of BGP messages exchanged while in the Established state? (Choose two.)
Answer: B,D
Explanation:
Update messages are exchanged between BGP peers in the Established state to advertise new routes, withdraw previously advertised routes, and share path attributes for reachable prefixes.
Notification messages are used to signal errors detected in the BGP session and immediately terminate the session when a protocol error occurs.
NEW QUESTION # 168
You are configuring LDP in a service provider network. After enabling LDP on core interfaces, you notice that labels are being advertised for every loopback IPv4 address that is in your IGP. Which label distribution mode is being used in this scenario?
Answer: A
Explanation:
In the context of theLabel Distribution Protocol (LDP), the method by which a router advertises labels to its neighbors is defined by itsLabel Advertisement Mode. According to Juniper Networks documentation and industry standards (RFC 5036), there are two primary modes:Downstream Unsolicited (DU)and Downstream on Demand (DoD).
InDownstream Unsolicited (DU)mode, which is the default behavior for Junos OS and most service provider implementations, an LSR (Label Switching Router) does not wait for a specific request from its neighbors.
Instead, as soon as the LSR learns a prefix through its Interior Gateway Protocol (IGP) and establishes an LDP session, it automatically generates a label for that prefix and advertises it to all of its LDP peers. This explains the scenario where labels appear for every loopback address in the IGP as soon as LDP is enabled.
DU mode is highly efficient for fast convergence because the labels are already present in the neighbors' databases before they are even needed for traffic forwarding.
By contrast,Downstream on Demand (DoD)requires a router to explicitly request a label for a specific prefix from its next-hop neighbor.Ordered Control (Option B)andIndependent Controlrefer to thetimingof label creation (whether a router waits for the next-hop to provide a label before creating its own), while Conservative Retention (Option A)refers to how a router stores labels it receives but doesn't currently use for forwarding. In the Junos default environment, LDP utilizesDownstream Unsolicitedadvertisement combined withOrdered ControlandLiberal Retentionto ensure a robust and rapidly converging MPLS control plane.
NEW QUESTION # 169
By default, which routing table contains a list of all ingress LSPs?
Answer: C
Explanation:
In the Juniper Networks Junos operating system, the management of routing information is partitioned into several distinct routing tables (RIBs), each serving a specific architectural purpose. When dealing with Multiprotocol Label Switching (MPLS), understanding the distinction between inet.0 and inet.3 is fundamental for troubleshooting and traffic engineering.
Theinet.3routing table is specifically designed to store the egress IPv4 addresses ofLabel-Switched Paths (LSPs). When an ingress router successfully establishes an LSP (via RSVP or LDP), it places the host address of the egress router (the tail-end) into the inet.3 table. This table is not used for general packet forwarding; instead, it is primarily used by theBorder Gateway Protocol (BGP)for next-hop resolution. When BGP receives a route, it checks both inet.0 and inet.3 to resolve the next hop. If a matching entry exists in inet.3, the router knows it can reach that destination via an MPLS tunnel, allowing for the encapsulation of BGP traffic within MPLS.
In contrast,inet.0is the default unicast routing table used for standard IPv4 forwarding and contains routes learned via IGPs (OSPF, IS-IS) or static routing.inet.1is utilized for multicast forwarding (MBGP), andinet.2 is typically used for Multicast Source Discovery Protocol (MSDP) or RPF checks in multicast environments.
By isolating LSP egress points in inet.3, Junos prevents MPLS-specific paths from interfering with standard IGP path selection unless the administrator explicitly chooses to merge them (e.g., using the traffic- engineering bgp-igp command). Therefore, by default, the ingress router maintains its list of reachable LSP endpoints in inet.3.
NEW QUESTION # 170
Which two solutions are commonly used to send IPv6 traffic over IPv4 networks? (Choose two.)
Answer: B,C
Explanation:
6to4 is an IPv6 transition mechanism that encapsulates IPv6 packets inside IPv4 packets, allowing IPv6 traffic to traverse an IPv4 network infrastructure.
6over4 is another tunneling mechanism that transports IPv6 packets over an IPv4 network by using IPv4 as the underlying transport, enabling IPv6 communication across IPv4-only networks.
NEW QUESTION # 171
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