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| Section | Weight | Objectives |
|---|---|---|
| IS-IS | 10-15% | - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics - Configuration and route exchange |
| Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing tables, static routes and route preference - Routing instances and route selection criteria |
| IP Multicast | 5-10% | - IGMP operation and configuration - PIM Dense Mode, Sparse Mode and RP mechanisms - Multicast routing monitoring and troubleshooting |
| BGP | 15-20% | - Routing policies, filtering and common troubleshooting - Route advertisement, attributes and path selection - Neighbor relationships and session establishment |
| 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 |
| Tunnels and Overlays | 5-10% | - Tunnel types, encapsulation and operation - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity |
| High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Network resiliency design and troubleshooting - Redundancy protocols and failover mechanisms |
| Layer 2 Security | 10-15% | - Port security, MAC limiting and storm control - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Layer 2 firewall filters and security features |
| OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
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NEW QUESTION # 38
Referring to the output shown in the exhibit, which two statements are true?
Answer: B,C
NEW QUESTION # 39
R1 has a BGP session with a router that has a peer autonomous system number of 64501. It is exchanging routes, and is advertising those routes to IBGP peers. The downstream IBGP peers, however, cannot pass traffic to the advertised networks.
Referring to the exhibit, which configuration change must occur to solve this problem?
Answer: A
NEW QUESTION # 40
A GRE tunnel is experiencing fragmentation issues. You confirm that the tunnel is up and is functioning correctly. You confirm that hosts are sending 1500-byte packets.
In this scenario, which statement is correct?
Answer: C
Explanation:
GRE encapsulation adds a fixed 24 bytes of overhead to every packet it carries - 4 bytes for the GRE header itself and 20 bytes for the new outer IPv4 delivery header. When a host transmits a full 1500-byte Ethernet payload into a gr- interface, the resulting encapsulated packet becomes 1524 bytes, which exceeds the physical interface's standard 1500-byte MTU and forces fragmentation or drops if the don't-fragment bit is set.
The correct remediation is to reduce the effective MTU seen by end hosts so that encapsulated packets never exceed the physical link's transmission limit. Junos automatically applies this logic to gr- logical interfaces, which default to a 1476-byte protocol MTU (1500 minus 24), but when the underlying physical interface or a manually configured path is involved, administrators must explicitly size the interface MTU to 1476 bytes to prevent post-encapsulation oversize packets. Allowing fragmentation with clear-dont-fragment is a workaround that increases CPU load and can degrade performance rather than solving the root cause, BFD addresses link-failure detection rather than MTU sizing, and ToS copying affects only the type-of-service byte, not packet length. Reference topics: Junos Enterprise Routing - Tunneling, GRE Encapsulation and MTU Considerations; Junos OS Configuring GRE Tunnel Interfaces.
NEW QUESTION # 41
Which two statements are correct about martian routes? (Choose two.)
Answer: A,D
Explanation:
Martian routes are never installed in the route table.
Martian routes refer to IP addresses or prefixes that are considered invalid or reserved, and they are not installed in the routing table.
Additional prefixes can be added to the list of martian routes.
Network administrators can configure the system to treat additional prefixes as Martian routes based on specific network policies or requirements.
NEW QUESTION # 42
You are establishing a new BGP session to an EBGP peer using loopback addresses. In addition to your general EBGP settings, which BGP feature must be enabled for this session to establish?
Answer: B
Explanation:
By default, EBGP sessions are built with the expectation that peers are directly connected at Layer 3, and Junos enforces this by sending EBGP packets with a TTL of 1. When loopback addresses are used as the session endpoints instead of the directly connected physical interface addresses, the resulting IP packets must traverse at least one additional router hop between the two loopbacks, and a TTL of 1 will expire in transit before reaching the remote loopback, causing the TCP handshake -- and therefore the BGP session -- to fail even though a valid route to the peer's loopback exists. The multihop statement (configured as an EBGP multihop parameter with an accompanying TTL value, most commonly set to 2 for a single intermediate hop) instructs Junos to increase the TTL used for that peer's BGP packets so they survive the extra hop count between loopbacks. This is a mandatory addition any time an EBGP session is deliberately built against non-directly-connected addresses, whereas IBGP sessions, by contrast, do not have this default restriction because IBGP already assumes peers may be multiple hops apart within the same AS. Multipath affects load-balancing across equal-cost paths, damping suppresses flapping routes, and passive controls whether a router waits for the remote peer to initiate the TCP connection -- none of these resolve the TTL expiration problem inherent to loopback-based EBGP peering.
NEW QUESTION # 43
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