Exam 200-301 topic 1 question 410 discussion

A and B timers match by default

Timers match by default The process ID can be the same or not The router ID mustn't be the same So answer is A and B

When it says activate OSPF on an interface it reffers to the command "Network x.x.x.x mask" Thats how you activate OSPF on an interface

also OSPF active on both sides by default

A & B are correct timers match by default

It´s AB

"OSPF is enabled on an interface when the network address for the interface matches the range of addresses that is specified by thenetworkarea command, which is entered in router configuration mode. Alternatively, you can enable OSPFv2 explicitly on an interface by using the ip ospf area command, which is entered in interface configuration mode. This capability simplifies the configuration of unnumbered interfaces with different areas." https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-3e/iro-xe-3e-book/iro-mode-ospfv2.pdf You're welcome

B & C are correct

configure the interfaces as OSPF active on both sides? command dosnt exist to set ospf active on an interface? maybe hello-interval but that would fall under C and to active ospf its done via route ospf <process ID> command in global config mode

Silly question imo

Hello and Dead time are the same by default 10 for hello and 40 (or 4x hello) for the dead

AB should be correct. There's no need to manually configure the timers. Cisco IOS shall use the default timer values automatically if none was configured.

at least one router should be active, so if both are active it's good also, by default they are passive, so you NEED to configure them. and also SAME area ID. C is no good because you don't NEED to config hello and dead because by default they are the same value. so answer is A and B

OSPF Neighborship Requirement In order to become OSPF neighbor following values must be match on both routers. Area ID Authentication Hello and Dead Intervals Stub Flag MTU Size

This was ChatGPT answer for why A its incorrect and B and C are correct Option A is not a valid configuration step for establishing an OSPF neighbor relationship. OSPF neighbors are discovered dynamically through the exchange of hello packets, so configuring the interfaces as OSPF active is not necessary. In OSPF, two devices become neighbors when they exchange hello packets on a common subnet. In this case, since the connecting interfaces are already in the same subnet, the next steps are: Configure both interfaces with the same area ID (Option B). OSPF routers only become neighbors and exchange information with other routers in the same OSPF area. The area ID can be configured on the interface using the ip ospf area command. Configure the hello and dead timers to match on both sides (Option C). OSPF neighbors must agree on the interval between hello packets and the interval after which an unresponsive neighbor is considered dead. These timers can be adjusted using the ip ospf hello-interval and ip ospf dead-interval commands.

Enabling OSPF SUMMARY STEPS 1. enable 2. configure terminal 3. router ospf process-id 4. network ip-address wildcard-mask area area-id 5. end https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16/iro-xe-16-book/iro-cfg.html#GUID-51A06D7A-7099-453C-A9FD-34CE45080796

Look when you configure both interfaces with the same area ID and that is what you should and must do, you active OSPF on that interfaces , so answer A sh*t ,and answer B correct. answer D&E are sh*t you know why, leaving answer C and that OK