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| Section | Objectives |
|---|---|
| Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
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NEW QUESTION # 209
Which statement describes how a generated route determines its next hop?
Answer: A
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least- specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Generate Routes and Primary Contributor Selection.
NEW QUESTION # 210
Which statement is correct about the configuration shown in the exhibit?
Answer: B
NEW QUESTION # 211
You have enabled MACsec on two directly connected Ethernet devices but MACsec is not working. Which two actions will solve this problem? (Choose two.)
Answer: C,D
Explanation:
MACsec (IEEE 802.1AE) secures a point-to-point Ethernet link independently of how the logical unit above it is configured for VLAN tagging, so neither trunk mode nor access mode has any bearing on whether the MACsec Key Agreement (MKA) protocol can establish a secure channel.
What does determine success is the pre-shared key material: when static CAK security mode is used, the Connectivity Association Key (CAK) and the Connectivity Association Key Name (CKN) must be configured identically on both ends of the link. If they do not match, MKA never completes the exchange, no secure channel is created, and all traffic on that interface is dropped rather than merely left unencrypted. Equally important, and frequently overlooked, is that MACsec adds up to 32 bytes of overhead per frame for the security tag (SecTAG) and integrity check value (ICV); Juniper's official guidance is to ensure the difference between the interface's physical MTU and the protocol MTU is large enough to absorb this overhead, or frames will be silently discarded once encryption is active, producing symptoms that look identical to a failed session.
Both the CAK/CKN and MTU checks are documented first-line troubleshooting steps for MACsec on EX Series switches.
NEW QUESTION # 212
The ISP1.inet.0 route table has currently no routes in it.
What will happen when you commit the configuration shown on the exhibit?
Answer: D
Explanation:
The configuration shown in the exhibit is an example of a routing instance of type virtual-router. A routing instance is a collection of routing tables, interfaces, and routing protocol parameters that create a separate routing domain on a Juniper device. A virtual-router routing instance allows administrators to divide a device into multiple independent virtual routers, each with its own routing table.
The configuration also includes a rib-group statement, which is used to import routes from one routing table to another. A rib-group consists of an import-rib statement, which specifies the source routing table, and an export-rib statement, which specifies the destination routing table. In this case, the rib-group name is inet-to-ispi, and the import-rib statement specifies inet.0 as the source routing table. The export-rib statement specifies ispi.inet.0 as the destination routing table.
This means that the routes from inet.0 will be imported into ispi.inet.0.
NEW QUESTION # 213
Refer to Exhibit:
You have applied a firewall filter as an ingress filter on the ge-0/0/0 interface of your Juniper Networks EX Series Switch as shown in the exhibit. An external host sends an ICMP ping packet to the router.
Which statement is correct about how this packet is processed?
Answer: B
Explanation:
Junos firewall filters evaluate terms sequentially from top to bottom, and a term is only terminal for a packet if its then clause contains an explicit terminating action such as accept, discard, reject, or next term without a match. The count and log actions used in track-icmp are non-terminating; they update statistics and generate a log entry but do not stop evaluation, so a matching ICMP packet falls through to the next term after being counted. The second term, allow-tcp-established, matches only TCP packets carrying the ACK or RST flags as defined by the tcp-established keyword; an ICMP echo request does not satisfy protocol tcp, so this term is skipped entirely and does not accept the packet. Evaluation therefore reaches the implicit catch-all term block- rest, which has no from conditions and matches every remaining packet, incrementing blocked-counter and discarding it. The net effect for the described ICMP ping is that icmp-counter is incremented by the first term, the packet is neither accepted nor rejected by the second term, and blocked-counter is incremented immediately before the packet is silently discarded by the final term. This layered-term behavior, where counting is independent of the accept/discard decision, is a frequently tested nuance of Junos firewall filter processing logic. Reference topics: Junos Enterprise Switching - Layer 2 Security and Firewall Filters, Filter Term Evaluation Order.
NEW QUESTION # 214
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