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96.
Which of the following is not true regarding Cisco IOS default settings for administrative distance?
- A.EIGRP internal: 90
- B.OSPF external: 110
- C.EIGRP external: 90
- D.RIP: 120
- E.OSPF internal: 110
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| EIGRP, by default, sets a different AD for internal (90) and external (170) routes. The rest of the answers are accurate regarding default settings. |
97.
A network includes a RIPv2 domain, an EIGRP domain, and an OSPF domain. Each
pair of routing domains has multiple routers redistributing routes between the pair
of domains. The design requires that the redistribution configuration avoid matching
based on prefix/length because of the trouble in maintaining such configurations.
Which of the following tools can be used in all three routing domains to attempt to
prevent domain loops? (This book uses the term domain loop to refer to the long
routes that might be chosen for routes when redistribution exists—for example, a
route might forward packets from the EIGRP domain, to the OSPF domain, back to
EIGRP, and then to subnet X in the RIP domain.)
- A.Setting route tags
- B.Setting the default administrative distance differently for internal and external routes
- C.Setting administrative distance differently per route
- D.Setting metrics much higher for all external routes than for all internal routes
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
|
All the answers list reasonable options in some cases, but the only feature listed
that is useful with all three routing protocols is the route tag feature. RIPv2 does not
support the concept of differentiating between internal and external routes, so the
two answers that suggest setting administrative distance (AD) based on the route
type (internal or external) could not be used in all three routing domains, as required
by the question. All three routing protocols support setting route tags and setting the AD per route. However, because RIPv2 cannot match based on the route type (internal/external), the option to set the route tags is the only option that applies to all three routing domains. |
98.
A coworker is developing an implementation plan for a design that uses OSPF 2 and
RIPv2 routing domains, with two routers redistributing between the two domains.
The coworker asks your help in choosing how to prevent domain loops by setting
administrative distance. Assuming that all other related settings use defaults, which
of the following would solve the domain loop problem?
- A.The distance ospf intra-area 80 inter-area 80 OSPF subcommand
- B.The distance ospf external 80 OSPF subcommand
- C.The distance ospf intra-area 180 inter-area 180 OSPF subcommand
- D.The distance ospf external 180 OSPF subcommand
- Answer & Explanation
- Report
Answer : [D]
Explanation :
Explanation :
| AD can be used to prevent the domain loop problem with two routing domains by making each routing protocol’s AD for internal routes be better (lower) than the other routing protocol’s AD for external routes. RIP uses AD 120 for all routes, with no distinction of internal or external. As such, OSPF’s internal default AD settings of 110 meet the requirement that OSPF’s internal AD (110) is better than RIP’s external (120). However, RIP’s default of 120 is not better than OSPF’s default for externals (110), so the distance ospf external 180 command changes that setting to meet both requirements. The three wrong answers, while syntactically valid, do not help meet the requirements. |
99.
Router R1 sets a route tag for subnet 10.1.1.0/24 when redistributing from OSPF into
EIGRP. Which of the following units is assigned to the route tag?
- A.Kilobits/second
- B.Tens-of-microseconds
- C.Cost
- D.Hop count
- E.No units assigned
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| Route tags are unitless integers that can be given to a route and even passed between different routing protocols by routers that perform redistribution. |
100.
Identify the architectural components of Cisco Express Forwarding (CEF). (Choose two.)
- A.Routing Information Base (RIB
- B.Adjacency Table
- C.Forwarding Information Base (FIB
- D.ARP Cache
- Answer & Explanation
- Report
Answer : [B and C]
Explanation :
Explanation :
|
Cisco Express Forwarding (CEF) maintains its information in two tables,
the Adjacency Table (which contains information about Layer 2 adjacencies) and
the Forwarding Information Base (FIB) (which contains Layer 3 information). The Routing Information Base (RIB) is a data structure used by a routing protocol such as OSPF. The ARP Cache contains IP address to MAC address mappings. Although information from the ARP Cache is used to help populate the Adjacency Table, the ARP Cache itself is not a CEF table. |
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