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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 Switching and VLANs | 15-20% | - VLAN concepts, configuration, trunking and tagging - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis |
| Topic 2: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features |
| Topic 3: IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Configuration and route exchange - Adjacency establishment, levels and metrics |
| Topic 4: Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
| Topic 5: BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment - Route advertisement, attributes and path selection |
| Topic 6: High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms |
| Topic 7: Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing instances and route selection criteria - Routing tables, static routes and route preference |
| Topic 8: IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting - IGMP operation and configuration |
| Topic 9: OSPF | 15-20% | - Configuration, verification and troubleshooting - Route summarization and redistribution - Neighbor formation, area design and LSA types |
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NEW QUESTION # 143
How does BGP prevent routing loops between internal peers?
Answer: C
Explanation:
BGP employs two distinct loop-prevention mechanisms depending on whether peers are external or internal to the same autonomous system. Between external peers (EBGP), loop prevention relies on the AS path attribute: every time a route crosses an AS boundary, the local AS number is prepended to the path, and a router rejects any incoming route whose AS path already contains its own AS number, since that would indicate the route has looped back around. Between internal peers (IBGP) within the same AS, however, the AS path attribute never changes, because IBGP does not add AS numbers as routes are readvertised internally
- meaning AS path alone cannot detect an internal loop. Instead, IBGP enforces a strict split-horizon-style rule: a router that learns a route via IBGP must never readvertise that route to another IBGP peer. This rule guarantees that every IBGP speaker within the AS must be directly peered with every other IBGP speaker (a logical full mesh) in order for all routers to receive all routes, since no IBGP router will relay IBGP-learned routes onward on another router's behalf. This full-mesh requirement is precisely why techniques such as route reflection and confederations were later developed - they preserve the same loop-prevention guarantee while relaxing the physical full-mesh peering burden. VRRP and BFD serve entirely unrelated purposes (gateway redundancy and fast failure detection, respectively) and play no role in BGP loop prevention.
Reference topics: Junos Enterprise Routing - BGP, IBGP Split-Horizon and the Full-Mesh Requirement.
NEW QUESTION # 144
You need to block SSH (TCP port 22) traffic from the 192.168.10.0/24 network.
Which firewall filter term is correct in this scenario?
Answer: C
NEW QUESTION # 145
You have traffic for a video streaming application traversing a GRE tunnel in your network and users are reporting poor performance. Both ends of the tunnel are using the default settings for a gigabit Ethernet interface, but you observe excessive packet drops due to exceeding the MTU.
Which two steps would you take to improve connectivity for this application? (Choose two.)
Answer: C,D
Explanation:
The described symptom -- excessive packet drops specifically attributed to exceeding the MTU on a GRE tunnel carrying full-size video streaming traffic across default-MTU gigabit Ethernet interfaces -- is a direct consequence of the 24 bytes of GRE encapsulation overhead pushing packets that were already at or near the standard 1500-byte Ethernet MTU past the physical interface's transmission limit once the outer GRE and IP headers are added. The most durable fix is to proactively increase the physical member interfaces' MTU beyond the 1500-byte default -- to
1524 bytes or higher -- which provides sufficient headroom to absorb the full GRE encapsulation overhead without ever causing the fully encapsulated packet to exceed the interface's transmission capability, allowing full-size 1500-byte payloads to pass through the tunnel intact and without fragmentation or drops. As a complementary measure, configuring the clear-dont- fragment-bit option on the tunnel or member interfaces instructs Junos to clear the DF (don't fragment) bit on oversized packets rather than dropping them outright when they do exceed the available MTU, allowing the Packet Forwarding Engine to fragment and later reassemble the traffic instead of silently discarding it, which directly addresses the reported packet loss even under transient conditions. Simply raising the MTU only to 1500 bytes fails to account for the 24- byte GRE overhead and would not resolve the underlying oversize condition. Routing the tunnel over a higher-bandwidth link addresses potential congestion but does nothing to correct an MTU- based packet-size violation, which is the root cause explicitly identified in this scenario.
NEW QUESTION # 146
Both the R1 and R2 devices are advertising prefix X into AS 65530 with the BGP attributes shown in the exhibit.
Which statement is correct in this scenario?
Answer: D
NEW QUESTION # 147
Which two statements describe the purpose of a BGP notification message? (Choose two.)
Answer: B,C
Explanation:
A BGP NOTIFICATION message is one of the four core message types defined in RFC 4271, alongside OPEN, UPDATE, and KEEPALIVE, and it serves a very specific and narrow purpose within the protocol: whenever a BGP speaker detects an unrecoverable, fatal condition in the session -- such as a malformed OPEN message, an unsupported capability, a hold-timer expiration, a finite-state-machine error, or an administratively initiated reset -- it transmits a NOTIFICATION message to its peer immediately before closing the underlying TCP connection and tearing down the session entirely. This confirms that a NOTIFICATION always signals the termination of the session upon a fatal error, never a routine, in-session update. Structurally, every NOTIFICATION message carries a defined error code and error subcode field, which together precisely classify the category and specific nature of the fault that triggered the termination (for example, 'Cease' with a subcode indicating administrative shutdown, or 'Update Message Error' with a subcode indicating a malformed attribute), giving the receiving peer's administrator concrete diagnostic information about exactly why the session was torn down.
Updating route attributes while keeping a session alive is the role of the UPDATE message, not NOTIFICATION, and refreshing a neighbor's table without resetting the session describes the optional Route Refresh capability (a separate, distinct BGP mechanism), neither of which describes NOTIFICATION's function.
NEW QUESTION # 148
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