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| Section | Objectives |
|---|---|
| Topic 1: Routing Protocols | - OSPF configuration and troubleshooting - IS-IS overview - BGP fundamentals and policy control |
| Topic 2: Network Services | - Basic multicast concepts - NAT concepts in Junos |
| Topic 3: Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Topic 4: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 5: Layer 2 Switching Technologies | - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) - VLANs and trunking |
| Topic 6: High Availability | - VRRP configuration and behavior - Redundancy concepts in enterprise networks |
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NEW QUESTION # 193
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario?
(Choose two.)
Answer: A,D
Explanation:
In BGP, routing policies are used to control the flow of routing information between BGP peers.
Option C suggests that import policies are applied after the RIB-In table. This is correct because import policies in BGP are applied to routes that are received from a BGP peer, before they are installed in the local BGP Routing Information Base (RIB-In). The RIB-In is a database that stores all the routes that are received from all peers.
Option D suggests that export policies are applied after the RIB-Local table. This is correct because export policies in BGP are applied to routes that are being advertised to a BGP peer, after they have been selected from the local BGP Routing Information Base (RIB-Local). The RIB-Local is a database that stores all the routes that the local router is using.
NEW QUESTION # 194
Which two statements are correct about VRRP? (Choose two.)
Answer: A,B
Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.
NEW QUESTION # 195
You have traffic for a video streaming application traversing a GRE tunnel in your network and users are reporting poor performance. Both ends of the tunnel are using the default settings for a gigabit Ethernet interface, but you observe excessive packet drops due to exceeding the MTU.
Which two steps would you take to improve connectivity for this application? (Choose two.)
Answer: C,D
Explanation:
The described symptom - excessive packet drops specifically attributed to exceeding the MTU on a GRE tunnel carrying full-size video streaming traffic across default-MTU gigabit Ethernet interfaces - is a direct consequence of the 24 bytes of GRE encapsulation overhead pushing packets that were already at or near the standard 1500-byte Ethernet MTU past the physical interface's transmission limit once the outer GRE and IP headers are added. The most durable fix is to proactively increase the physical member interfaces' MTU beyond the 1500-byte default - to 1524 bytes or higher - which provides sufficient headroom to absorb the full GRE encapsulation overhead without ever causing the fully encapsulated packet to exceed the interface's transmission capability, allowing full-size 1500-byte payloads to pass through the tunnel intact and without fragmentation or drops. As a complementary measure, configuring the clear-dont-fragment-bit option on the tunnel or member interfaces instructs Junos to clear the DF (don't fragment) bit on oversized packets rather than dropping them outright when they do exceed the available MTU, allowing the Packet Forwarding Engine to fragment and later reassemble the traffic instead of silently discarding it, which directly addresses the reported packet loss even under transient conditions. Simply raising the MTU only to 1500 bytes fails to account for the 24-byte GRE overhead and would not resolve the underlying oversize condition. Routing the tunnel over a higher-bandwidth link addresses potential congestion but does nothing to correct an MTU-based packet-size violation, which is the root cause explicitly identified in this scenario. Reference topics: Junos Enterprise Routing - Tunneling, GRE MTU Sizing and Fragmentation Handling for High-Throughput Applications.
NEW QUESTION # 196
Your router receives two BGP routes for the same prefix. One route is learned from an IBGP neighbor, and the other route is learned from an EBGP neighbor. By default, which route will be selected as active in this scenario?
Answer: A
Explanation:
Once the two candidate routes have equal route preference and equal local preference (both defaulting to 100 unless modified by policy), the Junos BGP algorithm proceeds to its third decision step, which compares the length of each candidate's AS path attribute and selects whichever path carries the shortest AS path, since a shorter path is interpreted as traversing fewer autonomous system hops to reach the origin. This step occurs well before the algorithm ever reaches the specific EBGP-over-IBGP preference rule, which is only evaluated later, after local preference, AS path length, origin type, and MED have all already been compared and found equal between the candidates; because an IBGP-learned copy of a route typically retains the identical AS path that was originally received from the external AS (IBGP does not prepend the local AS number the way crossing an AS boundary does), it is entirely possible, and often the deciding scenario, for AS path length to differ between competing paths well before the algorithm would ever need to fall back on the IBGP- versus-EBGP tiebreak. Selecting a route purely because it was 'learned through IBGP' is not a rule that exists anywhere in the algorithm and would in fact typically be the opposite of Junos's later EBGP-preference tiebreak. Neither next- hop IP address value nor router ID value is compared with a 'highest wins' rule at any point in the standard path selection sequence -- where router ID is used at all, Junos prefers the lowest value, not the highest, making both of those distractors doubly incorrect.
NEW QUESTION # 197
Which two statements about BGP facilitate the prevention of routing loops between two autonomous systems? (Choose two.)
Answer: C,D
Explanation:
When an EBGP router advertises a route to a neighbor in a different AS, it appends its own AS number to the AS_PATH attribute. This helps other routers recognize the path the route has taken and prevents routing loops.
If an EBGP router receives a route advertisement that already contains its own AS number in the AS_PATH attribute, it will drop the route. This prevents the router from accepting a route that would create a routing loop.
NEW QUESTION # 198
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