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| Section | Objectives |
|---|---|
| Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Routing Protocols | - IS-IS overview - BGP fundamentals and policy control - OSPF configuration and troubleshooting |
| Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
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NEW QUESTION # 21
Which OSPF packet type is sent when an OSPF router detects its database is stale?
Answer: C
NEW QUESTION # 22
Referring to the exhibit, which three statements are correct? (Choose three.)
Answer: B,C,D
Explanation:
The IP source guard is enabled.
The configuration shows that ip-source-guardis explicitly enabled under dhcp-security.
Dynamic ARP inspection is enabled.
The configuration also includes arp-inspectionunder dhcp-security, which indicates that Dynamic ARP Inspection (DAI) is enabled.
DHCP snooping is enabled.
DHCP snooping is implied as enabled because both IP source guard and ARP inspection are dependent on the DHCP snooping database to function properly. Even though DHCP snooping is not explicitly mentioned, its presence is required for these features to work.
NEW QUESTION # 23
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: D
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 # 24
Which IS-IS PDU should be used by a router to list all LSPs that it believes should exist in the link-state database?
Answer: C
Explanation:
The Complete Sequence Number PDU (CSNP) is the IS-IS mechanism used to summarize the entire contents of a router's link-state database, listing the LSP ID, sequence number, checksum, and remaining lifetime for every LSP the sending router currently believes should exist in the database for that level. On broadcast (LAN) circuits, the elected Designated Intermediate System periodically transmits CSNPs to all routers on the segment as a database-synchronization mechanism; any receiving router compares the summarized list against its own local database, and any discrepancy -- an LSP it is missing entirely, or one for which it holds an older sequence number -- triggers a targeted request for the specific, updated LSP content. On point-to-point circuits, a single CSNP is exchanged once when the adjacency first comes up, serving the identical synchronization purpose without needing periodic repetition. The Partial Sequence Number PDU (PSNP), by contrast, is used to acknowledge receipt of specific LSPs or to explicitly request specific LSPs identified as missing or outdated after a CSNP comparison, making it a partial, targeted PDU rather than a complete database listing. The LSP itself is the PDU that actually carries the detailed topology and reachability information being advertised, rather than a database summary. The IS-IS Hello PDU (IIH) is used purely for neighbor discovery and adjacency maintenance and carries no link-state database summary information whatsoever.
NEW QUESTION # 25
Your BGP neighbors, one in the USA and one in France, are not establishing a connection with each other.
Referring to the exhibit, which statement is correct?
Answer: B
Explanation:
In the configuration shown, BFD (Bidirectional Forwarding Detection) liveness detection is globally configured, but for BFD to work with specific BGP neighbors, it must be configured under each BGP neighbor or BGP group. Without specific BFD configuration at the neighbor or group level, BFD will not be used to monitor the BGP sessions, which might be causing the BGP neighbors not to establish a connection.
NEW QUESTION # 26
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