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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: High Availability | 5-8% | - Nonstop active routing - NSR and GRES concepts - Graceful restart |
| Topic 2: Spanning Tree Protocols | 8-12% | - STP, RSTP, MSTP, VSTP - BPDU and protection features - Configuration and convergence - Port roles and states |
| Topic 3: IPv6 | 8-12% | - Address types and format - Autoconfiguration - OSPFv3 and BGP for IPv6 - Static and dynamic routing |
| Topic 4: Border Gateway Protocol (BGP) | 20-25% | - Basic operation and message types - IBGP and EBGP - Policy and route filtering - Configuration and troubleshooting - Path selection and attributes |
| Topic 5: Open Shortest Path First (OSPF) | 15-20% | - LSA types and operation - Areas and router types - Link-state database - Configuration and troubleshooting |
| Topic 6: Tunnels | 5-8% | - GRE and IP-IP tunnels - Tunnel configuration and usage |
| Topic 7: Protocol-Independent Routing | 10-15% | - Static, aggregate, and generated routes - Load balancing - Routing instances and RIB groups - Martian addresses - Filter-based forwarding |
| Topic 8: Layer 2 Bridging and VLANs | 8-12% | - Service provider switching features - VLANs and trunking - Bridging concepts |
| Topic 9: Intermediate System to Intermediate System (IS-IS) | 10-15% | - Configuration and monitoring - Adjacencies and levels - PDUs and TLVs - Metrics and wide metrics |
| Topic 10: Multiprotocol Label Switching (MPLS) | 12-18% | - Terminology and forwarding - LDP and RSVP - Configuration and monitoring - Labels and LIB - Segment routing basics |
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NEW QUESTION # 22
Which OSPF packet type is used to initiate and maintain neighbor relationships?
Answer: C
Explanation:
TheHello packetis the most basic, yet most vital, component of the OSPF protocol. It serves as the primary mechanism for neighbor discovery, parameter negotiation, and "keepalive" functionality. Per Juniper Networks' routing documentation, OSPF routers use the Hello protocol to dynamically discover other OSPF- enabled routers on their directly connected segments.
When OSPF is enabled on a Junos interface, the router begins multicasting Hello packets (typically to the
224.0.0.5"All OSPF Routers" address). This initiates the neighbor relationship. For two routers to move beyond theInitstate and become neighbors, they must agree on several critical parameters contained within the Hello packet:
* Area ID:Routers must be in the same OSPF area.
* Authentication:Passwords or keys must match.
* Timers:The Hello and Dead intervals must be identical.
* Options:Such as Stub area flags.
Beyond the initial "initiation," the Hello packet is used tomaintainthe relationship. By continuously sending these packets at a fixed interval (the Hello interval), a router signals to its peers that it is still functional. If a router stops receiving Hello packets from a neighbor for a duration exceeding theDead Interval, it declares the neighbor "down," flushes the associated LSAs from the database, and triggers a new SPF calculation.
Furthermore, on multi-access networks like Ethernet, the Hello packet is the vehicle for the election of the Designated Router (DR)andBackup Designated Router (BDR). By exchanging priority values and Router IDs within the Hello packets, the segment can elect a central point of contact to minimize the number of adjacencies required on the wire.
NEW QUESTION # 23
By default, which router in an MPLS LSP removes the PLS header?
Answer: D
NEW QUESTION # 24
Which two statements are correct when using LDP? (Choose two.)
Answer: B,D
Explanation:
With Label Distribution Protocol (LDP), a full mesh of label-switched paths (LSPs) is automatically created between all LDP-enabled routers, and these paths are reflected in the inet.3 table. LDP LSPs are set up when LDP is enabled on interfaces connecting routers in an MPLS network.
NEW QUESTION # 25
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: A,D
Explanation:
In IS-IS, Level 1 routes are usually contained within the same area and Level 2 routes are used to interconnect different areas. By default, routes from Level 1 are redistributed into Level 2, and vice versa, to ensure reachability between areas.
By default, IS-IS protocol leaks routing information from a Level 1 area to a Level 2 area.
However, to leak routing information from a Level 2 area to a Level 1 area, an export policy must be explicitly configured.
NEW QUESTION # 26
What are three extension headers supported by IPv6? (Choose three.)
Answer: A,B,D
Explanation:
One of the most significant architectural improvements in IPv6 is the move from a complex, variable-length header (as seen in IPv4) to a streamlined, fixed-length base header of 40 bytes. Additional functionality that was previously handled by "Options" in IPv4 is now moved toExtension Headers, which are inserted between the IPv6 base header and the upper-layer protocol (TCP/UDP).
According to Juniper Networks technical documentation and RFC 8200, the following are valid IPv6 Extension Headers:
* Hop-by-Hop Options (Option B):This header carries optional information that must be examined by every node along the delivery path. It is used for features like the Router Alert and Jumbo Payload options.
* Fragment (Option E):Unlike IPv4, where any router can fragment a packet, in IPv6, fragmentation is performed only by the source node. The Fragment header contains the information necessary for the destination to reassemble the packet (Offset, Identification, and More Fragments flag).
* Destination Options (Option A):This header carries information intended only for the destination node. It can appear twice: once before a routing header and once after.
Why other options are incorrect:
* Protocol (Option C):In IPv4, this was a field in the header. In IPv6, this is replaced by theNext Header field, which identifies the type of the following header (whether it's an extension header or the upper- layer protocol).
* Header Checksum (Option D):This field was entirely removed in IPv6. IPv6 relies on the data link layer (Ethernet) and the transport layer (TCP/UDP) to perform error detection, significantly reducing the processing overhead for routers in the core of a service provider network.
NEW QUESTION # 27
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