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| Section | Weight | Objectives |
|---|---|---|
| IS-IS | 10-15% | - Configuration and route exchange - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting |
| Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features - Port security, MAC limiting and storm control |
| Layer 2 Switching and VLANs | 15-20% | - Link Aggregation Groups (LAG) and Virtual Chassis - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging |
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| BGP | 15-20% | - Neighbor relationships and session establishment - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting |
| Protocol Independent Routing | 10-15% | - Routing tables, static routes and route preference - Basic routing policy and filter operation - Routing instances and route selection criteria |
| IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting - IGMP operation and configuration |
| OSPF | 15-20% | - Route summarization and redistribution - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting |
| High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting |
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NEW QUESTION # 116
A switch uses the factory-default storm control configuration. A sudden unknown-unicast burst causes packet loss for only 4-5 seconds before stabilizing.
Which statement describes why normal operation resumes automatically?
Answer: D
Explanation:
The factory-default storm control configuration on EX Series switches operates in a purely rate-limiting mode rather than an interface-shutdown mode. When broadcast, multicast, or unknown-unicast traffic on a port exceeds the configured bandwidth-percentage threshold, the default action is simply to police the offending traffic type and silently drop only the packets that exceed that threshold, while all traffic within the allowed rate continues to be forwarded normally and the interface itself remains administratively and operationally up throughout the event. This explains the observed symptom precisely: during the burst of unknown-unicast frames, the switch dropped the excess volume above the configured limit, producing a brief period of packet loss, but as soon as the burst subsided and traffic fell back under the threshold, storm control simply stopped dropping packets and normal forwarding resumed automatically - no administrative shutdown, recovery timer, or manual intervention was ever involved, because the interface was never taken down in the first place. This default drop-only behavior is distinct from the optional interface-shutdown action, which must be explicitly configured if an administrator wants storm control to disable a port outright on violation (as seen in a related scenario requiring the clear ethernet-switching recovery-timeout command). Storm control by default covers broadcast, multicast, and unknown-unicast traffic types together, not multicast alone, and it has no functional relationship to GRES, which governs Routing Engine redundancy rather than Layer 2 traffic policing. Reference topics: Junos Enterprise Switching - Storm Control, Default Drop Behavior Versus Interface Shutdown Action.
NEW QUESTION # 117
You enable persistent MAC learning on your Juniper switch. In this scenario, which statement is correct?
Answer: B
NEW QUESTION # 118
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. Reference topics:
Junos Enterprise Routing - Tunneling, Understanding Generic Routing Encapsulation.
NEW QUESTION # 119
You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?
Answer: B
Explanation:
The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp.
This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP. This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence. The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches. Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning:
STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor.
To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode.
NEW QUESTION # 120
Which statement describes the additional overhead added when a packet is encapsulated in a GRE tunnel?
Answer: D
Explanation:
A GRE-encapsulated packet consists of the original passenger packet wrapped inside a GRE header and a new outer IP delivery header, and the combined size of these two additions is what constitutes GRE's per-packet overhead. The base GRE header, as defined in RFC 2784 and used in its minimal, non-keyed, non-checksummed form (the default and most common deployment), is exactly 4 bytes in length, containing the flags/version field and the protocol type field identifying the encapsulated payload's ether type. Layered around that GRE header is a completely new outer IPv4 header, which itself consumes a standard 20 bytes, containing the tunnel source and destination addresses used for delivery across the underlying network. Adding these two components together -- 4 bytes for the GRE header plus 20 bytes for the new outer IPv4 header -- yields a total of exactly 24 bytes of overhead imposed on every encapsulated packet, which is precisely why Junos automatically sets the default protocol MTU on gr- tunnel interfaces to 1476 bytes (1500 minus 24) to prevent oversized, post-encapsulation packets from requiring fragmentation on a standard 1500-byte Ethernet path. The 20-byte figure alone describes only the new IP header in isolation and omits the GRE header itself, while 12 and 32 bytes do not correspond to any standard, non-keyed GRE encapsulation configuration and are included purely as plausible-looking distractors.
NEW QUESTION # 121
......
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