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| Section | Weight | Objectives |
|---|---|---|
| Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity - Tunnel types, encapsulation and operation |
| IP Multicast | 5-10% | - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration - Multicast routing monitoring and troubleshooting |
| Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging |
| OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| BGP | 15-20% | - Neighbor relationships and session establishment - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting |
| IS-IS | 10-15% | - Configuration and route exchange - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics |
| 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 |
| High Availability and Resiliency | 5-10% | - Redundancy protocols and failover mechanisms - Graceful restart and non-stop routing - Network resiliency design and 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 |
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NEW QUESTION # 144
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure. By default, what impact will this failure have on traffic forwarding between the switches?
Answer: D
Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating. When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link-status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors -- full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation -- reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption.
NEW QUESTION # 145
Depending on the link type, OSPF sends link-state update packets to which two addresses? (Choose two.)
Answer: A,D
Explanation:
OSPF relies on two IANA-reserved multicast addresses to distribute its control-plane traffic across broadcast and NBMA network types, and Link State Update (LSU) packets, which carry the actual LSAs being flooded, are addressed to one or the other depending on the role of the sending router. The address 224.0.0.5, designated AllSPFRouters, is used when any OSPF router - including a router that is itself the Designated Router or Backup Designated Router - needs to flood an LSU to every OSPF-speaking router on the segment; this is the address used for Hello packets universally and for LSU flooding directed at the entire segment. The address 224.0.0.6, designated AllDRouters, is used specifically by non-DR, non-BDR routers (DROthers) when they need to send an LSU or other update destined for the DR and BDR only, since only the DR and BDR actually listen on this address; the DR then takes responsibility for reflooding that information to the rest of the segment using 224.0.0.5. This two-address design is central to how OSPF achieves flooding efficiency on multi-access networks by funneling updates through the DR rather than requiring full-mesh flooding among every router pair. The addresses 224.0.0.8 and 224.0.0.9 are not used by OSPF at all;
224.0.0.9 is in fact reserved for RIPv2 multicast updates, making it a plausible-looking but incorrect distractor. Reference topics: Junos Enterprise Routing - OSPF, Multicast Addressing for Hello and Link State Update Packets.
NEW QUESTION # 146
You have configured a GRE tunnel from your local router with tunnel source 10.0.0.1 to a remote router at destination 192.168.0.1. The tunnel is functioning until you commit set routing-options static route 0.0.0.0/0 next-hop gr-0/0/0. This configuration causes the tunnel to go down. Which statement is correct in this scenario?
Answer: C
Explanation:
A GRE tunnel's outer, delivery-layer packets are forwarded using the router's ordinary underlay routing table, meaning the tunnel destination address (192.168.0.1 in this case) must itself be resolvable to a physical, non-tunnel next hop for the encapsulated packets to actually leave the router. Before this configuration change, the default route (or some more specific route) presumably pointed toward a real physical next hop, allowing the router to reach 192.168.0.1 and keep the tunnel operational. When the administrator commits a static default route of 0.0.0.0/0 with a next hop of gr-0/0/0, every destination lookup that previously fell back to the default route -- including the lookup for the tunnel's own destination address, 192.168.0.1, since no more specific route exists for it -- now recurses through the GRE interface itself. This creates a circular dependency: the router needs to route to 192.168.0.1 to keep the tunnel up, but the only route it has to reach 192.168.0.1 now points back into the tunnel that requires 192.168.0.1 to already be reachable, so the interface's next-hop resolution fails and the tunnel drops. This is an entirely valid and common GRE design pitfall rather than any platform restriction; GRE interfaces can be legitimately used as static route next hops, do not require loopback-sourced encapsulation, and do not require a /32 host route to resolve their destination, provided that route does not recursively point back through the tunnel.
NEW QUESTION # 147
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: B,D
NEW QUESTION # 148
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. Reference topics: Junos Enterprise Routing - BGP, Configuring EBGP Multihop Sessions.
NEW QUESTION # 149
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