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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: High Availability | 5-8% | - Graceful restart - NSR and GRES concepts - Nonstop active routing |
| Topic 2: Protocol-Independent Routing | 10-15% | - Routing instances and RIB groups - Filter-based forwarding - Martian addresses - Load balancing - Static, aggregate, and generated routes |
| Topic 3: Multiprotocol Label Switching (MPLS) | 12-18% | - Configuration and monitoring - LDP and RSVP - Terminology and forwarding - Labels and LIB - Segment routing basics |
| Topic 4: Tunnels | 5-8% | - GRE and IP-IP tunnels - Tunnel configuration and usage |
| Topic 5: Layer 2 Bridging and VLANs | 8-12% | - Bridging concepts - VLANs and trunking - Service provider switching features |
| Topic 6: Open Shortest Path First (OSPF) | 15-20% | - Areas and router types - Link-state database - Configuration and troubleshooting - LSA types and operation |
| Topic 7: IPv6 | 8-12% | - OSPFv3 and BGP for IPv6 - Static and dynamic routing - Autoconfiguration - Address types and format |
| Topic 8: Border Gateway Protocol (BGP) | 20-25% | - Path selection and attributes - Policy and route filtering - Basic operation and message types - IBGP and EBGP - Configuration and troubleshooting |
| Topic 9: Intermediate System to Intermediate System (IS-IS) | 10-15% | - Configuration and monitoring - Metrics and wide metrics - PDUs and TLVs - Adjacencies and levels |
| Topic 10: Spanning Tree Protocols | 8-12% | - Port roles and states - Configuration and convergence - BPDU and protection features - STP, RSTP, MSTP, VSTP |
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NEW QUESTION # 154
Which two solutions are commonly used to send IPv6 traffic over IPv4 networks? (Choose two.)
Answer: B,D
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 # 155
Exhibit:
You have configured an MPLS LSP to 192.168.100.3. However, the LSP is in the down state. Referring to the exhibit, which two actions would solve this problem? (Choose two.)
Answer: B,D
Explanation:
In a Juniper Networks environment, establishing a functionalMultiprotocol Label Switching (MPLS)Label- Switched Path (LSP) requires synchronized control plane operations. According to Juniper technical documentation, the most common reason for an LSP to remain in the "Down" state at the ingress router is a failure of theConstrained Shortest Path First (CSPF)algorithm during the path computation phase.
The provided exhibit for routerR1reveals a critical error in the show mpls lsp detail output: "CSPF: could not determine self". This specific error indicates that the CSPF process is unable to find its own local router ID within theTraffic Engineering Database (TED). For CSPF to build a valid TED, the underlying Interior Gateway Protocol (IGP), such as OSPF, must be configured to flood opaque link-state advertisements (Type
10 LSAs) that carry traffic engineering attributes. As seen in the OSPF configuration, traffic engineering is not enabled. Therefore, issuing theset protocols ospf traffic-engineeringcommand (Option D) will allow R1 to populate the TED with its own local information and that of its neighbors, enabling CSPF to calculate a valid path.
Alternatively, an administrator can choose to bypass the requirement for a TED entirely by disabling CSPF on the specific LSP. By issuing theset protocols mpls label-switched-path to-r3 no-cspfcommand (Option B), the router will stop attempting to perform a constrained path calculation. Instead, the signaling protocol (RSVP) will rely on the standardinet.0routing table to determine the hop-by-hop path to the egress destination (192.168.100.3), allowing the LSP to establish without traffic engineering constraints.
Regarding the other options, whilefamily mplsis required on all transit interfaces, the ingress loopback interface (lo0) generally does not require it for standard LSP signaling unless it's used as a transit hop.
Furthermore, adding a static route toinet.3(Option A) is used for next-hop resolution of BGP routes over LSPs but does not assist in the signaling or establishment of the LSP itself.
NEW QUESTION # 156
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 # 157
You are asked to add next-hop redundancy using VRRP for an IPv6 enabled service. The configured primary router must always be active when available, and the servers connected to the network must be able to ping their gateway. Which VRRP element is required to accomplish this requirement?
Answer: D
Explanation:
InVirtual Router Redundancy Protocol (VRRP), the primary goal is to provide a highly available default gateway for end hosts. However, there is a specific operational behavior in the VRRP standard (RFC 3768
/RFC 5798) regarding how the "Virtual Router" responds to traffic destined for its own Virtual IP (VIP).
According to Juniper Networks documentation, by default, a VRRP router that is in the Master state will only respond to packets destined for the VIP if that router is theIP Address Owner(meaning its physical interface IP matches the VIP). If the router is a "non-owner" (a common configuration in many networks), it will forward traffic on behalf of the VIP but will not respond to management traffic, such asICMP Echo Requests (Pings), directed at the VIP itself.
To satisfy the requirement that "servers connected to the network must be able to ping their gateway," the accept-data (Option D)parameter must be configured. In Junos OS, the accept-data statement allows the VRRP Master to respond to traffic destined for the virtual IP address even if it is not the address owner. This includes responding to Pings and allowing other management connections like SSH or Telnet to the VIP.
Regarding the other options:
* Preempt (Option B):While preempt is often used to ensure the primary router regains control, in Junos, a router with the highest priority (255) defaults to preemptive behavior, and accept-data is specifically what solves the "pinging the gateway" requirement.
* Track (Option A):Tracking is used for failover logic but doesn't affect the ability to ping the VIP.
* Static ARP (Option C):This is unnecessary as VRRP uses a virtual MAC address to ensure hosts can resolve the VIP via standard NDP (for IPv6) or ARP (for IPv4).
NEW QUESTION # 158
Click the Exhibit button. You have a network often routers that have all been configured with an identical SRGB. The exhibit shows the IS-IS configuration from a router called R10. The other nine routers do not yet have an IPv4 shortest-path SR-MPLS LSP to this router.
Which missing part of the configuration must you add on R10 to solve this problem?
Answer: C
Explanation:
For other routers to build an IPv4 shortest-path SR-MPLS LSP to R10, R10 must advertise a reachable SR node segment for its IPv4 loopback/prefix. Configuring an explicit IPv4 node SID ensures R10's loopback prefix is associated with a SID in the SRGB and is advertised in IS-IS, allowing the rest of the network to compute and label-switch traffic to R10 using SR.
NEW QUESTION # 159
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