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| Section | Weight | Objectives |
|---|---|---|
| Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging - Link Aggregation Groups (LAG) and Virtual Chassis |
| Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Basic routing policy and filter operation - Routing tables, static routes and route preference |
| High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms |
| BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection - Neighbor relationships and session establishment |
| IP Multicast | 5-10% | - IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms |
| IS-IS | 10-15% | - Configuration and route exchange - Adjacency establishment, levels and metrics - Scalable enterprise deployment and troubleshooting |
| OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| Layer 2 Security | 10-15% | - Layer 2 firewall filters and security features - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control |
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration |
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NEW QUESTION # 70
Which OSPF packet type is sent when an OSPF router detects its database is stale?
Answer: B
NEW QUESTION # 71
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: A,C
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. Reference topics: Junos Enterprise Routing - Tunneling, GRE MTU Sizing and Fragmentation Handling for High-Throughput Applications.
NEW QUESTION # 72
What are three well-known mandatory BGP attributes? (Choose three.)
Answer: B,C,D
NEW QUESTION # 73
Which statement is true about IP-IP tunnels?
Answer: A
NEW QUESTION # 74
Referring to the exhibit, Router-1 and Router-2 are failing to form an IS-IS adjacency.
What should you do to solve the problem?
Answer: A
NEW QUESTION # 75
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