READ Free Dumps For Cisco- 200-125
| Question ID 13621 | Refer to the graphic.
R1 is unable to establish an OSPF neighbor relationship with R3. What are possible
reasons for this problem? (Choose two.)
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| Option A | All of the routers need to be configured for backbone Area 1.
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| Option B | R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.
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| Option C | A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.
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| Option D | The hello and dead interval timers are not set to the same values on R1 and R3.
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| Option E | EIGRP is also configured on these routers with a lower administrative distance.
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| Option F | R1 and R3 are configured in different areas.
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| Correct Answer | D,F |
Explanation Explanation: This question is to examine the conditions for OSPF to create neighborhood. So as to make the two routers become neighbors, each router must be matched with the following items: 1. The area ID and its types; 2. Hello and failure time interval timer; 3. OSPF Password (Optional).
| Question ID 13622 | What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)
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| Option A | It requires the use of ARP.
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| Option B | It can support multiple IPv6 subnets on a single link.
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| Option C | It supports up to 2 instances of OSPFv3 over a common link.
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| Option D | It routes over links rather than over networks.
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| Correct Answer | B,D |
Explanation Explanation: Here is a list of the differences between OSPFv2 and OSPFv3: ✑ They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols ✑ OSPFv3 introduces new LSA types ✑ OSPFv3 has different packet format ✑ OSPFv3 uses different flooding scope bits (U/S2/S1) ✑ OSPFv3 adjacencies are formed over link-local IPv6 communications ✑ OSPFv3 runs per-link rather than per-subnet ✑ OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses ✑ OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) ✑ OSPFv3 Neighbor Authentication done with IPsec (AH) ✑ OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html