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| Section | Objectives |
|---|---|
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Layer 2 Security | - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection - MACsec and storm control |
| IS-IS | - Link-state database and PDUs - Adjacencies and troubleshooting - Levels, areas and metrics |
| BGP | - EBGP and IBGP peer interactions - BGP basic operations and message types - Attributes and path selection |
| Protocol-Independent Routing | - Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups |
| Spanning Tree | - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence |
| Layer 2 Switching and VLANs | - Bridging components - Ports and VLAN tagging - Inter-VLAN routing - Native VLANs and voice VLANs - Frame processing |
| High Availability | - Virtual chassis and graceful restart - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG |
| OSPF | - Areas and LSA types - Link-state database and packet types - Router ID, adjacencies and neighbors |
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NEW QUESTION # 65
Which two fields must match in an OSPF hello packet to form an adjacency over a broadcast link? (Choose two.)
Answer: C,D
Explanation:
RFC 2328 specifies a precise set of parameters that two OSPF routers on a broadcast network must agree upon before a valid neighbor relationship can be established, and a mismatch in any of these mandatory fields causes the routers to reject each other's Hello packets outright rather than forming even a basic 2-Way state.
The network mask carried in each Hello packet must match between neighbors on a broadcast segment, since OSPF uses this field to confirm both routers agree on the subnet boundaries of the shared segment; a mismatched mask (for example, one router configured with a /24 and its neighbor with a /25 on the same physical wire) is treated as a configuration error and blocks adjacency formation. The router dead interval, which defines how long a router will wait without receiving a Hello before declaring a neighbor down, must likewise match exactly between neighbors, alongside the closely related hello interval, since these timers govern the shared expectations both sides have for how frequently Hellos should arrive and how quickly a failure should be detected; Junos explicitly checks and rejects Hello packets carrying a mismatched dead interval value. Router priority, by contrast, is intentionally allowed to differ between neighbors on the same segment - it exists precisely so that administrators can differentiate router preference for the DR/BDR election, and differing values are expected and normal rather than being blocked. The designated router field, as advertised within each Hello, is informational about the sender's current view of the segment's DR and is not a value that must be identical between the two Hello senders to permit adjacency formation. Reference topics: Junos Enterprise Routing - OSPF, Required Hello Parameter Matching on Broadcast Networks.
NEW QUESTION # 66
Which statement is true about Layer 2 firewall filters on EX Series switches?
Answer: D
NEW QUESTION # 67
You want to ensure traffic is routed through a GRE tunnel. In this scenario, which two statements will satisfy this requirement? (Choose two.)
Answer: A,B
Explanation:
Option A is correct. For traffic to be sent through a GRE tunnel, there must be a route that directs the traffic into the tunnel. This is typically accomplished through the use of a static route or a dynamic routing protocol.
Option B is correct. All intermediary devices must have a route to the tunnel endpoints. In real- world scenarios, the tunnel endpoints for a tunnel going over the Internet must have globally reachable internet addresses. Otherwise, intermediate routers in the Internet cannot forward the tunneled packets.
NEW QUESTION # 68
You are using OSPF to advertise the subnets that are used by the Denver and Dallas offices. The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets.
Referring to the exhibit, which two statements are correct? (Choose two.)
Answer: A,C
Explanation:
The routers that are directly connected to the Dallas and Denver subnets are not advertising the connected subnets. This can be resolved by redistributing the connected subnets into OSPF.
Option C suggests to configure and apply a routing policy that redistributes the connected Dallas and Denver subnets. This is correct because redistribution allows routes from one routing protocol to be communicated to another, and in this case, it allows the connected subnets to be advertised through OSPF.
Option D suggests enabling the passive option on the OSPF interfaces that are connected to the Dallas and Denver subnets. This is also correct because in OSPF, a passive interface is an interface that belongs to the OSPF router, but does not send OSPF Hello packets. It's typically used on an interface that you don't want to use for OSPF adjacencies, but you still want to advertise its IP address. Therefore, enabling passive interface can help in advertising the Dallas and Denver subnets.
NEW QUESTION # 69
Which two characteristics describe the default behavior of aggregate routes? (Choose two.)
Answer: B,C
Explanation:
The entire purpose of route aggregation is summarization -- replacing a set of more-specific contributing routes with a single, broader prefix advertised outward -- and this summarization inherently hides internal routing instability from external peers: if one of the underlying contributing /24 blocks within a summarized /16 flaps up and down due to a local link issue, external peers who only see the stable, unchanging /16 aggregate are completely insulated from that churn, since the aggregate itself remains active and advertised as long as at least one contributing route is present, regardless of how much internal fluctuation occurs among the individual contributors. This stability- hiding characteristic is one of the primary operational benefits that motivates using aggregate routes in the first place, confirming that statement as correct. Regarding next-hop behavior, official Juniper documentation is explicit and unambiguous:
when an aggregate route is installed in the routing table, Junos assigns it a reject next hop by default, meaning traffic matching only the aggregate (and no more-specific contributor) is dropped and an ICMP unreachable message is returned to the source; a discard next hop is available only as an optional, explicitly configured alternative when silent dropping without ICMP notification is preferred, but it is not the default. Aggregate routes categorically do not advertise their individual contributing routes; suppressing those specific, more- granular prefixes from onward advertisement in favor of the single summary is the aggregate's defining function, directly contradicting the first statement.
NEW QUESTION # 70
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