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| Section | Objectives |
|---|---|
| Topic 1: OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
| Topic 2: Layer 2 Security | - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters - BPDU, loop and root protection - MACsec and storm control |
| Topic 3: High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| Topic 4: Layer 2 Switching and VLANs | - Frame processing - Native VLANs and voice VLANs - Ports and VLAN tagging - Bridging components - Inter-VLAN routing |
| Topic 5: Protocol-Independent Routing | - Martian addresses and RIB groups - Load balancing and filter-based forwarding - Static, aggregate, generated routes |
| Topic 6: IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| Topic 7: Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
| Topic 8: BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| Topic 9: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
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NEW QUESTION # 152
You are combining two existing interfaces into a single LAG interface, but you do not see the LAG interface being created. Which two actions are required to solve this problem? (Choose two.)
Answer: A,B
NEW QUESTION # 153
Refer to Exhibit:
You have applied a firewall filter as an ingress filter on the ge-0/0/0 interface of your Juniper Networks EX Series Switch as shown in the exhibit. An external host sends an ICMP ping packet to the router.
Which statement is correct about how this packet is processed?
Answer: C
Explanation:
Junos firewall filters evaluate terms sequentially from top to bottom, and a term is only terminal for a packet if its then clause contains an explicit terminating action such as accept, discard, reject, or next term without a match. The count and log actions used in track-icmp are non-terminating; they update statistics and generate a log entry but do not stop evaluation, so a matching ICMP packet falls through to the next term after being counted. The second term, allow-tcp-established, matches only TCP packets carrying the ACK or RST flags as defined by the tcp-established keyword; an ICMP echo request does not satisfy protocol tcp, so this term is skipped entirely and does not accept the packet. Evaluation therefore reaches the implicit catch-all term block- rest, which has no from conditions and matches every remaining packet, incrementing blocked-counter and discarding it. The net effect for the described ICMP ping is that icmp-counter is incremented by the first term, the packet is neither accepted nor rejected by the second term, and blocked-counter is incremented immediately before the packet is silently discarded by the final term. This layered-term behavior, where counting is independent of the accept/discard decision, is a frequently tested nuance of Junos firewall filter processing logic. Reference topics: Junos Enterprise Switching - Layer 2 Security and Firewall Filters, Filter Term Evaluation Order.
NEW QUESTION # 154
You enable the point-to-point parameter on your OSPF interface configuration. In this scenario, what are two benefits of this action? (Choose two.)
Answer: C,D
Explanation:
Configuring interface-type p2p under an OSPF interface tells Junos to treat that interface as a point-to-point network type regardless of the underlying physical medium, which removes the interface from the standard broadcast-network state machine entirely. On a true broadcast network, two routers must first complete a Designated Router and Backup Designated Router election, wait through the associated timers, and only then proceed through 2-Way, ExStart, Exchange, and Loading before reaching Full -- a multi-step process. A point-to-point interface skips DR/BDR election altogether and proceeds directly from 2-Way into ExStart, so adjacencies form measurably faster, which is the first correct benefit. Because there is no DR on a point-to- point interface, Junos also does not generate a Type 2 Network LSA to describe the segment; the connected subnet is instead advertised as a simple stub-network entry inside the Router LSA itself, eliminating an entire LSA type from the area's link-state database and reducing its overall size, which is the second correct benefit. Point-to-point configuration is entirely incompatible with DR election, so a router configured this way cannot 'win' a DR election -- there is no DR to win.
Advertisement of the connected network happens on any operational OSPF interface irrespective of network type, so that option describes normal OSPF behavior rather than a benefit specific to the point-to-point setting.
NEW QUESTION # 155
What are two reasons for creating multiple areas in OSPF? (Choose two.)
Answer: B,D
Explanation:
Option A is correct. Creating multiple areas in OSPF can help to reduce the convergence time .
This is because changes in one area do not affect other areas, so fewer routers need to run the SPF algorithm in response to a change.
Option D is correct. Creating multiple areas in OSPF can help to reduce Link State Advertisement (LSA) flooding across the network. This is because LSAs are not flooded out of their area of origin.
NEW QUESTION # 156
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 # 157
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