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| Section | Objectives |
|---|---|
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Protocol-Independent Routing | - Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups |
| Layer 2 Security | - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - BPDU, loop and root protection - Layer 2 firewall filters |
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| BGP | - EBGP and IBGP peer interactions - BGP basic operations and message types - Attributes and path selection |
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Bridging components - Inter-VLAN routing - Ports and VLAN tagging - Frame processing |
| OSPF | - Areas and LSA types - Router ID, adjacencies and neighbors - Link-state database and packet types |
| Spanning Tree | - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence |
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NEW QUESTION # 178
You implement FBF on router R1 so that traffic from subnet 172.25.0.0/24 uses ISP-A and traffic from subnet
172.25.1.0/24 uses ISP-B. You create forwarding instances for ISP-A and ISP-B. You also configure static default routes inside each instance. However, the static default routes remain inactive.
In this scenario, which action would complete the FBF implementation?
Answer: C
Explanation:
A classic and well-documented gotcha in filter-based forwarding deployments is that the static default route configured inside each forwarding instance frequently references a next-hop address that Junos cannot resolve, simply because the interface and other directly connected routes needed to validate that next hop as reachable exist only in the master inet.0 table by default, not automatically inside the newly created forwarding instance's own table. Since a static route's next hop must be resolvable against routes present within its own routing table to become active, the static default routes inside the ISP-A and ISP-B forwarding instances remain inactive precisely because the necessary interface/next-hop routes were never made visible inside those instances. The standard solution taught for this exact FBF scenario is to configure a routing information base (RIB) group that explicitly imports the relevant interface routes between the master inet.0 table and each forwarding instance's table, allowing the static default route's next hop inside each instance to resolve correctly against the leaked routes and become active. Applying a firewall filter without ever attaching it to an interface accomplishes nothing, since an unapplied filter never evaluates any traffic. Increasing the static route's preference value only affects which competing route wins selection and does nothing to resolve an unreachable next hop. Changing the instance type away from forwarding (to virtual-router) would in fact break FBF entirely, since filter-based forwarding specifically depends on the forwarding instance type working together with a routing-instance firewall filter action. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Filter-Based Forwarding and RIB Group Route Leaking.
NEW QUESTION # 179
Which statement is correct about the storm control feature?
Answer: D
Explanation:
The storm control feature is enabled in the factory-default configuration on EX Series switches.
On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces. On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces.
NEW QUESTION # 180
Which statement is correct about graceful Routing Engine switchover (GRES)?
Answer: B
Explanation:
The Graceful Routing Engine Switchover (GRES) feature in Junos OS enables a router with redundant Routing Engines to continue forwarding packets, even if one Routing Engine fails.
GRES preserves interface and kernel information, ensuring that traffic is not interrupted.
However, GRES does not preserve the control plane.
To preserve routing during a switchover, GRES must be combined with either Graceful Restart protocol extensions or Nonstop Active Routing (NSR). When GRES is combined with NSR, nearly
75 percent of line rate worth of traffic per Packet Forwarding Engine remains uninterrupted during GRES. Any updates to the primary Routing Engine are replicated to the backup Routing Engine as soon as they occur.
Therefore, when GRES is combined with NSR, routing is preserved and the new master RE does not restart rpd.
NEW QUESTION # 181
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
Answer: B,C
Explanation:
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device. A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet- switching. The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term. To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer
3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks.
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface
NEW QUESTION # 182
Refer to Exhibit:
Click the Exhibit button.
Which two statements about the output shown in the exhibit are correct? (Choose two.)
Answer: A,C
Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0
/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation - no IIH PDUs are sent or expected on it - but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false. Reference topics: Junos Enterprise Routing - IS-IS, Interface Levels and Passive Interfaces.
NEW QUESTION # 183
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