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| Section | Objectives |
|---|---|
| OSPF and IS-IS Routing Protocols | - OSPF configuration and troubleshooting
|
| Service Provider Architecture & Junos Fundamentals | - Service provider network design basics
|
| Troubleshooting and Operations | - Network troubleshooting methodology
|
| BGP and Routing Policy | - BGP fundamentals
|
| MPLS and Service Provider Technologies | - VPN services
|
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NEW QUESTION # 105
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: A
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 # 106
Which statement is true about the BGP active state?
Answer: B
NEW QUESTION # 107
Which two statements about graceful restart are correct? (Choose two.)
Answer: B,D
Explanation:
Graceful Restart (GR)is a high-availability mechanism designed to minimize the impact of a routing protocol process (rpd) restart or a Routing Engine (RE) switchover. It allows a router to continue forwarding traffic while the control plane is recovering, provided that the data plane (Packet Forwarding Engine) remains intact.
According to Juniper Networks documentation, Graceful Restart operates in two distinct roles:
* Restarting Mode:This is the role of the router that is actually undergoing the restart. In Junos OS, this mode isnot enabled by default (Option A). An administrator must explicitly configure graceful-restart under the [edit routing-options] hierarchy to allow the router to signal its neighbors that it is attempting a graceful recovery.
* Helper Mode:This is the role of the neighboring routers. When a neighbor sees a router restart, if it is in "helper mode," it will continue to forward traffic toward the restarting router and will not flush the associated routes from its forwarding table for a specified period. In Junos,helper mode is enabled by default (Option B)for most protocols (OSPF, BGP, IS-IS). This means that even if you haven't configured GR on your own router, it will automatically assist its neighbors if they perform a graceful restart.
Why other options are incorrect:
* Option C:WhileGRES (Graceful Routing Engine Switchover)is often usedwithGraceful Restart to handle hardware-level RE failures, they are independent features. GR can function during a simple software process restart without dual REs or GRES.
* Option D:Nonstop Bridging (NSB)is a separate high-availability feature for Layer 2 protocols (like STP). While it shares a similar goal, Graceful Restart is specifically a Layer 3 protocol mechanism (Layer 2 does not use "helper" routers in the same way).
NEW QUESTION # 108
What are three extension headers supported by IPv6? (Choose three.)
Answer: B,C,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 # 109
What is the default export behavior of IS-IS in the Junos OS?
Answer: D
Explanation:
In Junos OS, IS-IS does not automatically export routes from the routing table into the IS-IS protocol. By default, no routes are advertised into IS-IS unless an explicit export policy is configured to control which prefixes should be advertised.
NEW QUESTION # 110
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