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56.
Router R1 has four routes to subnet 2. The one successor route has a metric of 100,
and the one feasible successor route has a metric of 350. The other routes have metrics of 450 and 550. R1’s EIGRP configuration includes the variance 5 command.
Choose the answer that refers to the highest-metric route to subnet 2 that will be visible in the output of the show ip route eigrp command on R1.
- A.The successor route (metric 100)
- B.The feasible successor route (metric 350)
- C.The route with metric 450
- D.The route with metric 550
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| The unequal-cost load-balancing features allow IOS to place multiple unequal-cost routes into the routing table. The restrictions are that the metric must be less than or equal to variance times the feasible distance (5 times 100 in this case), so three of the routes meet this requirement, ruling out the route with metric 550. This feature also allows only successor and feasible successor routes, ruling out the route with metric 450. Of the two routes that meet both requirements, the route with metric 350 has the highest metric, as requested in the question text. |
57.
Which of the following Internet edge designs include connections to two ISPs?
(Choose two answers.)
- A.Single homed
- B.Single multihomed
- C.Dual homed
- D.Dual multihomed
- Answer & Explanation
- Report
Answer : [B and D]
Explanation :
Explanation :
| The word multihomed refers to designs in which the enterprise connects to (at least) two ISPs. The two choices that include the term homed refer to designs that connect to a single ISP |
58.
Which of the following features is true of eBGP but not iBGP?
- A.Connects routers in the same ASN
- B.Uses TCP
- C.Exchanges routes between an ISP and an enterprise
- D.None of the other answers is correct
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| External BGP, or eBGP, refers to BGP as used between two autonomous systems (as identified by using different autonomous system numbers). Both Interior BGP (iBGP) and eBGP use TCP. Only iBGP connects to other routers in the same ASN. The one answer that describes what eBGP does, but that iBGP does not, is that eBGP exchanges routes between an enterprise and an ISP, the two of which use different ASNs. |
59.
Consider the routes advertised over a typical single-homed Internet edge connection
that uses eBGP. Which of the following answers describe a route typically advertised
by eBGP in this case? (Choose two answers.)
- A.A default route advertised by the enterprise to the ISP
- B.A route for the enterprise’s public IPv4 address block to the ISP
- C.A route for the enterprise’s private IPv4 address block to the ISP
- D.A default route advertised by the ISP to the enterprise
- Answer & Explanation
- Report
Answer : [B and D]
Explanation :
Explanation :
| The enterprise typically advertises its public IPv4 address block to the ISP. There is no need to advertise its private IP address block, because Internet routers will not route packets to private IPv4 networks anyway. As for default routes, the enterprise can benefit from using a default route as advertised by the ISP, but not vice versa. |
60.
Routers R1 and R2, in two different ASNs, connect directly to each other over a
WAN link, with the two routers in the same subnet. If using the IP addresses on that
common link to define the eBGP neighbors, how many different BGP neighbor commands would be required on Router R1 to make the eBGP peer work to Router R2?
- A.1
- B.2
- C.3
- D.4
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
A. For this scenario, each router would need a neighbor ip-address remote-as asn
BGP subcommand, but no other neighbor commands. For example, if using ASNs 1
and 2, and link IP addresses 1.1.1.1 and 1.1.1.2, respectively, the configuration would
be, on R1:
router bgp 1 neighbor 1.1.1.2 remote-as 2 And on R2: router bgp 2 neighbor 1.1.1.1 remote-as 1 |
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