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- CCNA Routing and Switching 200-105
36.
A company has a small/medium-sized network with 15 routers and 40 subnets and
uses OSPFv2. Which of the following is considered an advantage of using a single area design as opposed to a multiarea design?
- A.Reduces the processing overhead on most Routing and Switching ICND2rs.
- B.Status changes to one link may not require SPF to run on all other Routing and Switching ICND2rs
- C.Simpler planning and operations.
- D.Allows for Routing and Switching ICND2 summarization, reducing the size of IP routing tables.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| The correct answer is the one advantage of using a single-area design. The three wrong answers are advantages of using a multiarea design, with all reasons being much more important with a larger internetwork. |
37.
Which of the following network commands, following the command Router ospf 1, tells
this Router to start using OSPF on interfaces whose IP addresses are 10.1.1.1, 10.1.100.1,
and 10.1.120.1?
- A.network 10.0.0.0 255.0.0.0 area 0
- B.network 10.0.0.0 0.255.255.255 area 0
- C.network 10.0.0.1 0.0.0.255 area 0
- D.network 10.0.0.1 0.0.255.255 area 0
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The network 10.0.0.0 0.255.255.255 area 0 command works, because it matches all interfaces whose first octet is 10. The rest of the commands match as follows: all addresses that end with 0.0.0 (wildcard mask 255.0.0.0); all addresses that begin with 10.0.0 (wildcard mask 0.0.0.255); and all addresses that begin with 10.0 (wildcard mask 0.0.255.255). |
38.
Which of the following network commands, following the command router ospf 1, tells
this router to start using OSPF on interfaces whose IP addresses are 10.1.1.1, 10.1.100.1,
and 10.1.120.1?
- A.network 10.1.0.0 0.0.255.255 area 0
- B.network 10.0.0.0 0.255.255.0 area 0
- C.network 10.1.1.0 0.x.1x.0 area 0
- D.network 10.1.1.0 255.0.0.0 area 0
- E.network 10.0.0.0 255.0.0.0 area 0
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| The network 10.1.0.0 255.255.255.255 area 0 command matches all IP addresses that begin with 10.1, enabling OSPF in area 0 on all interfaces. The answer with wildcard mask 0.255.255.0 is illegal, because it represents more than one string of binary 0s separated by binary 1s. The answer with 's is syntactically incorrect. The answer with wildcard mask 255.0.0.0 means "Match all addresses whose last three octets are 0.0.0," so none of the three interfaces are matched. |
39.
Which of the following commands list the OSPF neighbors off interface serial 0/0?
(Choose two answers.)
- A.show ip ospf neighbor
- B.show ip ospf interface brief.
- C.show ip neighbor
- D.show ip interface
- E.show ip ospf neighbor serial 0/0
- Answer & Explanation
- Report
Answer : [A][E]
Explanation :
Explanation :
| Of the three wrong answers, two are real commands that simply do not list the OSPF neighbors. show ip ospf interface brief lists interfaces on which OSPF is enabled, but does not list neighbors. show ip interface lists IPv4 details about interfaces, but none related to OSPF. One incorrect answer, show ip neighbor, is not a valid IOS command. |
40.
Routers R1, R2, and R3 are internal routers in areas 1, 2, and 3, respectively. Router
R4 is an ABR connected to the backbone area (0) and to areas 1, 2, and 3. Which of
the following answers describes the configuration on Router R4, which is different
from the other three routers, that makes it an ABR?
- A.The abr enable router subcommand
- B.The network router subcommands refer to a single nonbackbone area.
- C.The network router subcommands refer to multiple areas, including the backbone.
- D.The router has an interface in area 0, whereas an OSPF neighbor’s interface sits in a different area.
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| An ABR, by definition, connects to the backbone area plus one or more nonbackbone areas. To do so, the configuration enables OSPF so that at least one interface is in area 0 (backbone) and at least one interface is in some other area. For the incorrect answers, the abr enable command is imaginary. Routers internal to a nonbackbone area (which are therefore not ABRs) use OSPF network commands that all refer to the same nonbackbone area. Finally, two routers cannot become OSPF neighbors on a link if their interfaces are in different areas. |
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