JN0-663 · Question #63
Click the Exhibit button. user@R1> show ospf interface detail Interface State Area DR ID BDR ID Nbcs xe-0/0/1.0 BDR 0.0.0.0 2.169.37.12 11.244.245.215 1 Type LAN, address 192.161.27.11, Mask…
The correct answer is A. There is a mismatch in the dead interval parameter between routers R1 and R2. C. There is a mismatch in the hello interval parameter between routers R1 and R2. If the timers are equal, which they are by default in JUNOS (for LAN/P2P the Hello = 10s and Dead = 40s), the neighbors will establish a relationship (at least on 1 side). There is a Hello and Dead parameter mismatch. On R1 we see: DR addr 192.161.37.12, BDR addr 192.168.37.11…
Question
Click the Exhibit button. user@R1> show ospf interface detail Interface State Area DR ID BDR ID Nbcs xe-0/0/1.0 BDR 0.0.0.0 2.169.37.12 11.244.245.215 1 Type LAN, address 192.161.27.11, Mask 255.255.255.248, MTU 4460, Cost 40 DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128 Hello 10, Dead 40, ReXmit 5, Not Stub fe-0/2/1.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0 Type P2P, Address 0.0.0.0, Mask 0.0.0.0, MTU 1500, Cost 2604 Adj count 0 Hello 10, Dead 40, ReXmit 5, Not stub Auth type: MDS, Active key ID 3, Start time 2013 Jul 19 10:00:00 PST IPsec SA Name: sa user@R2> show ospf interface detail Interface State Area DR ID BDR ID Nbcs xe-1/1/1.0 BDR 0.0.0.0 192.168.37.12 11.244.245.216 1 Type LAN, address 192.161.27.12, Mask 255.255.255.248, MTU 4460, Cost 40 DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128 Hello 3, Dead 9, ReXmit 5, Not stub fe-2/2/2.0 PtToPt 0.0.0.0 0.0.0.0 0.0.0.0 Type P2P, address 0.0.0.0, Mask 0.0.0.0, MTU 1500, Cost 2604 Adj count 0 Hello 10, Dead 40, ReXmit 5, Not Stub Auth type: MDS, Active key ID 3, Start time 2013 Jul 19 10:00:00 PST IPsec SA Name: sa Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)
Exhibit
Options
- AThere is a mismatch in the dead interval parameter between routers R1 and R2.
- BThere is a mismatch in the hold timer parameter between routers R1 and R2.
- CThere is a mismatch in the hello interval parameter between routers R1 and R2.
- DThere is a mismatch in the poll interval parameter between routers R1 and R2.
How the community answered
(55 responses)- A80% (44)
- B13% (7)
- D7% (4)
Explanation
If the timers are equal, which they are by default in JUNOS (for LAN/P2P the Hello = 10s and Dead = 40s), the neighbors will establish a relationship (at least on 1 side). There is a Hello and Dead parameter mismatch. On R1 we see: DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128 Hello 10, Dead 40, ReXmit 5, Not Stub while on R2 we see: DR addr 192.161.37.12, BDR addr 192.168.37.11, Adj count 1, Priority 128 Hello 3, Dead 9, ReXmit 5, Not stub https://inetzero.com/what-is-your-ospf-neighbor-doing-adjancency-problems-in-ospf/
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