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| Section | Objectives |
|---|---|
| Topic 1: Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Topic 2: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
| Topic 3: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 4: Layer 2 Switching Technologies | - Ethernet switching concepts - VLANs and trunking - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 5: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 6: Routing Protocols | - IS-IS overview - BGP fundamentals and policy control - OSPF configuration and troubleshooting |
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NEW QUESTION # 90
In RSTP, which three port roles are associated with the discarding state? (Choose three.)
Answer: A,C,D
Explanation:
In Rapid Spanning Tree Protocol (RSTP), there are several port roles that determine the behavior of the port in the spanning tree. The roles include root, designated, alternate, backup, and disabled.
The discarding state is associated with the backup, alternate, and disabled roles. In a stable topology with consistent port roles throughout the network, RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state. Disabled ports are also in the discarding state.
NEW QUESTION # 91
On Juniper devices, which statement correctly describes a basic characteristic of a GRE tunnel?
Answer: A
Explanation:
GRE is fundamentally a stateless encapsulation protocol: the encapsulating router simply wraps the passenger packet in a GRE header and an outer delivery IP header and forwards it based on ordinary IP routing table lookups toward the configured tunnel destination address. For that forwarding to succeed, the underlying (global or routing-instance) routing table on each endpoint must contain a valid, reachable route to the far-end tunnel address; without such a route, the tunnel interface will not come up or will be unable to deliver traffic, since GRE relies entirely on the existing IP infrastructure rather than any tunnel-specific signaling to establish reachability.
Because GRE has no built-in state machine or session negotiation, it does not natively track whether the remote endpoint is alive -- that requires an optional add-on such as GRE keepalives or BFD, neither of which is enabled by default; an operator must explicitly configure them if failure detection is required. GRE is also protocol-agnostic rather than IPv4-only: it can encapsulate IPv4, IPv6, MPLS, and other network- layer protocols as the passenger, which is one of its defining advantages over IP-in-IP tunneling. Finally, because GRE keeps no per-session state about the peer, it cannot detect or report tunnel failures on its own, reinforcing why route reachability is the one true prerequisite for tunnel operation.
NEW QUESTION # 92
You need to apply a Layer 2 firewall filter on a Juniper Networks EX Series Switch to block traffic from the source MAC address 00:12:34:56:00:07 entering the switch on ge-0/0/3. After committing the configuration, traffic from the MAC address still passes through. Referring to the exhibit, which statement is correct in this scenario?
Answer: D
Explanation:
The intent of this filter is to match and discard traffic from one single, specific host MAC address, which requires the source-mac-address match condition to reference the complete, exact 48-bit address using an explicit /48 mask (or no mask at all, which Junos treats as an implicit full match) so that only that one precise address is matched. As configured, the term instead specifies a /40 mask on 00:12:34:56:00:07, meaning only the first 40 bits (the first five octets, 00:12:34:56:00) are actually significant to the match, while the sixth octet is effectively wildcarded across its full range; this produces an imprecise, overly broad match criterion rather than the single-host match the administrator intended, and is a common configuration mistake that undermines the predictability and correctness of MAC-based filtering. The lesson tested here is that source and destination MAC address match conditions in Junos firewall filters must be specified with the correct, deliberate, and explicit prefix length appropriate to the intended scope -- typically /48 for a single exact host -- rather than an arbitrary or miscalculated mask value. Firewall filters under family ethernet-switching are fully capable of matching on both source-mac-address and destination-mac-address, which rules out that option entirely. Layer 2 MAC-based filters function correctly on both access and trunk interface modes, so interface type is not a limiting factor here.
There is no indication in the exhibit that the filter's application direction (input versus output) is reversed.
NEW QUESTION # 93
You have configured a GRE interface, but no traffic will flow.
Referring to the exhibit, which statement is true?
Answer: A
NEW QUESTION # 94
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: C
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 # 95
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