OSPF Pop Questions II
NetworkVeteran
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in CCNP
DanielH wanted more OSPF scenarios for members seeking their CCNP.
Below is a brilliant physical topology utilizing my years of experience and networking prowess!
Q1. R1's configuration is below. What line(s) must you add to R1's configuration to make OSPF fully-operational?
Q2. R1's configuration is corrected and both routers become neighbors. What is the destination address of R1's hellos?
Q3. Which LSA below will contain R1's 1::1/128 address?
Q4. Can OSPFv3 carry IPv4 prefixes?
Q5. Does OSPFv3 provide authentication services?
Below is a brilliant physical topology utilizing my years of experience and networking prowess!
Q1. R1's configuration is below. What line(s) must you add to R1's configuration to make OSPF fully-operational?
ipv6 unicast-routing interface Loopback0 ipv6 address 1::1/128 ipv6 ospf 1 area 0 interface Serial0/0 ipv6 enable ipv6 ospf 1 area 0
Q2. R1's configuration is corrected and both routers become neighbors. What is the destination address of R1's hellos?
R1#show ipv6 ospf ne Neighbor ID Pri State Dead Time Interface ID Interface 2.2.2.2 1 FULL/ - 00:00:38 6 Serial0/0
Q3. Which LSA below will contain R1's 1::1/128 address?
R1#show ipv6 ospf database
OSPFv3 Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
ADV Router Age Seq# Fragment ID Link count Bits
1.1.1.1 1347 0x8000000B 0 1 None
2.2.2.2 1337 0x80000005 0 1 None
Link (Type-[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] Link States (Area 0)
ADV Router Age Seq# Link ID Interface
1.1.1.1 1442 0x80000002 6 Se0/0
2.2.2.2 1467 0x80000001 6 Se0/0
Intra Area Prefix Link States (Area 0)
ADV Router Age Seq# Link ID Ref-lstype Ref-LSID
1.1.1.1 1347 0x80000001 0 0x2001 0
2.2.2.2 1337 0x80000001 0 0x2001 0
R1#
Q4. Can OSPFv3 carry IPv4 prefixes?
Q5. Does OSPFv3 provide authentication services?
Comments
Don't wanna spoil people's fun!!!
I enjoyed that though, thanks. Maybe I'll have to devise a scenario to throw up for people.
My blog: mybraindump.co.uk
My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi
Ouch your hitting on my weakest subject but i'll stab at it.
Q1. R1's configuration is below. What line(s) must you add to R1's configuration to make OSPF fully-operational?
In regards to IPv6 implementations, OSPF isn't operational on the interface that connects the routers. Routing protocols must be enabled on interfaces, instead of via network subnets.
Q2. R1's configuration is corrected and both routers become neighbors. What is the destination address of R1's hellos?
If I am not mistaken it should still go to the address of 2.2.2.2, IPV6 RID address are still written in IPv4 format.
Q3. Which LSA below will contain R1's 1::1/128 address?
LSA 8 will contain Router 1's link local address
Q4. Can OSPFv3 carry IPv4 prefixes?
yes via tunneling methods IPv6-IPv4 tunnels
Q5. Does OSPFv3 provide authentication services?
To be honest, not real sure on this one. I would say yes because I don't see a reason why that should change between the two IP protocols
Now curious to see how I did as I answered from memory without looking ahead.
My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi
My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi
Good questions, please correct me if I'm wrong:
1. Under ipv6 router ospf 1, need to add router-id x.x.x.x. Also no shut the interface
2. Destination address is FF02::5
3. I'm assuming Type 8:
R1#sh ipv6 ospf database link OSPFv3 Router with ID (1.1.1.1) (Process ID 1) Link (Type-[IMG]https://us.v-cdn.net/6030959/uploads/images/smilies/icon_cool.gif[/IMG] Link States (Area 0) LS age: 646 Options: (V6-Bit E-Bit R-bit DC-Bit) LS Type: Link-LSA (Interface: Serial0/0) Link State ID: 6 (Interface ID) Advertising Router: 1.1.1.1 LS Seq Number: 80000001 Checksum: 0x45E2 Length: 44 Router Priority: 1 Link Local Address: FE80::C000:4FF:FEA0:0 Number of Prefixes: 0 R1#sh ipv6 int l0 Loopback0 is up, line protocol is up IPv6 is enabled, link-local address is FE80::C000:4FF:FEA0:0 Global unicast address(es): 1::1, subnet is 1::1/1284. I want to say yes because the ipv4 router-id shows in hello packets
5. Yes, authentication is handled by ipsec with md5 or sha1 parameters
Question 2 - "FF02::5". OSPF generally multicasts its hellos. Note, this is a point-to-point link, so no DR/BDRs. There are no neighbor statements, nor any indications it's a non-broadcast media where multicasts/broadcasts are impossible.
Question 3 - Type-9: Intra-Area Prefix LSA. Type 8 was a great guess. Note, IOS doesn't treat loopback interfaces like a normal OSPF (point-to-point or broadcast) interface, by default. An article describing what's in each LSA type:
A look at the new LSA types in OSPFv3 with Vyatta and Cisco
Question 4 - Yes! Address-family support was recently added. "I want to say yes because the ipv4 router-id shows in hello packets" Clever! While a RouterID is not to be precise an IP address, they follow the same format, and RouterIDs are often based on IPv4 addresses. "yes via tunneling methods IPv6-IPv4 tunnels" While tunneling would allow an IPv4 PDU to (indirectly) carry an OSPFv3 PDU, they would not allow an OSPFv3 PDU to carry an IPv4 PDU.
Question 5 - No. Straight from the RFC: "Authentication has been removed from the OSPF protocol." While OSPF no longer provides authentication, you can still authenticate your OSPF or RIPng messages, using IPv6 IPSec.
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My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi
Questions 3 is not covered by the Route FLG--besides the book noting types 1, 2, 3, 4, and 5 don't provide this information. That's why I said LSA Type 8 was a great guess, even though LSA Type 9 was the answer.
Question 4 is totally outside the scope of the exam.
Its always great to learn more outside the scope of the Cisco exams.
My ultimate career goal: To climb to the top of the computer network industry food chain.
"Winning means you're willing to go longer, work harder, and give more than anyone else." - Vince Lombardi