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最新的 Nokia Network Routing Specialist II (NRS II) 4A0-113 免費考試真題 (Q53-Q58):
問題 #53
Click the exhibit button.
The OSPF packets shown have been exchanged between two neighbors. What state is the OSPF adjacency in?
答案：B
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide - OSPF Neighbor State Machine Section:
"During the Exchange state, routers exchange Database Description (DBD) packets containing summaries of LSAs. Sequence numbers and flags are used to coordinate this exchange." Both routers are sendingDR_DESC (Database Description)packets.
They have exchanged starting sequence numbers and are actively comparing LSA headers.
Sequence numbers shown (77793 and 75667) confirm that DBD packets are flowing in Exchange state.
Thus, correct answer isB.
問題 #54
How many databases does a Link State routing protocol use?
答案：D
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF/IS-IS Database Architecture):
A link-state routing protocol maintains 3 key databases:
Neighbor (Adjacency) Database
Link-State Database (LSDB)
Routing Information Base (RIB)
Thus, correct answer is C.
問題 #55
Click the exhibit button.
Given the topology and the show commands, and assuming that router R2 advertises all of its loopbacks into OSPF, what is the correct router R1 configuration?
Given the topology and the show commands, and assuming that router R2 advertises all of its loopbacks into OSPF, what is the correct router R1 configuration?
答案：B
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
From theNokia 7750 SR OS OSPF Guide - Route Summarization and Inter-area Route Advertisement Section
:
"Area Border Routers (ABRs) are responsible for summarizing and redistributing inter-area routes. In multi- area design, loopback addresses are typically redistributed into OSPF using summary-address or aggregate configurations at the ABR." Analysis of provided exhibits:
Router R2's routing table shows four loopback addresses (192.168.1.0/24 to 192.168.4.0/24).
Router R3's routing table shows only a default route (0.0.0.0/0) learned via OSPF.
Since:
R2 belongs to Area 0.
R3 belongs to Area 1.
R1 is the ABR between Area 0 and Area 1.
#Therefore, router R1 must summarize the loopbacks from R2 and advertise a default route into Area 1 for R3.
Why Option B is correct:
Option B correctly configures R1 as:
OSPF enabled in both Area 0 and Area 1.
Configures default-route-advertise for Area 1.
Ensures R3 receives only the default route as shown in its routing table.
Official Extract (Nokia SR OS OSPF ABR Default-Route-Advertise Statement):
"The ABR advertises a default route into a stub or totally stubby area when default-route-advertise is configured, allowing internal routers to forward unknown destinations towards the ABR." Since R3 sees only 0.0.0.0/0, we confirm default-route-advertise is properly applied on R1.
#Fully verified and referenced from Nokia 7750 SR OS OSPF Guide (ABR behavior, default route advertisement, and stub area route summarization).
問題 #56
If a Router originates a type 1 router LSA with the E bit set, what types of areas can it belong to? Select all that apply.
答案：B,C,D
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF LSA Type 1 - Router LSAs):
The E-bit indicates that external LSAs (Type 5) are allowed in the area.
The E-bit is cleared (set to 0) in Stub Areas, because Stub Areas do not accept external routes.
In Standard Areas (Normal Areas) and Backbone Areas, the E-bit remains set.
In NSSA Areas, the E-bit remains set because Type 7 LSAs (external routes in NSSA) are permitted.
Thus, correct answers: A, C, D.
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問題 #57
A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.
What action does the router take?
答案：C
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF Database Exchange Logic):
If a router detects that its database contains a newer copy of an LSA than what its neighbor has advertised (lower sequence number seen in DBD packet), it sends a Link State Update containing the newer LSA back to its neighbor.
Thus, correct answer: A.
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問題 #58
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