H3C GB0-382 Certification Exam Sample Questions and Answers

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H3C GB0-382 (H3CSE-RS+) Sample Questions:

01. Six IS-IS routers share a broadcast segment in a manufacturer's datacentre. An engineer is about to raise the Level-2 priority on a newly installed router so that it becomes DIS, and has scheduled the change during business hours on the assumption that it will take effect only once the present DIS fails.
What actually happens when the priority is raised?
a) Nothing changes until the present DIS fails, the backup then assumes the role, and no LSP is reissued.
b) The new router becomes DIS at once, the pseudonode changes, and the segment's LSPs are reissued and reflooded.
c) The change waits for the next CSNP interval, the incumbent DIS retains the role, and the pseudonode identifier persists while its holding time runs.
d) Both routers act as DIS for the segment, each floods its own CSNPs, and the ambiguity persists while the priorities remain unequal.
 
02. A manufacturer runs OSPF in its northern datacentre and IS-IS in its southern one. Two border routers, BR-N and BR-S, each redistribute in both directions between the two protocols. Shortly after the second border router is brought into service, prefixes native to the OSPF domain start reappearing inside OSPF as external routes learned through IS-IS by way of the other border router, and traffic to some of them crosses the WAN and comes back.
Which two measures stop these routes from re-entering the protocol they came from?
(Choose two.)
a) Give both border routers the same redistribution metric, so the two returning copies are equal cost and are load-shared rather than competing.
b) Summarise the affected prefixes at each border router, so the specific routes that return are hidden inside a single aggregate advertisement.
c) Tag routes as they are redistributed out of OSPF, and deny any tagged route from being redistributed back into OSPF.
d) Apply a filter-policy on export at each border router that denies the prefixes native to a protocol from being redistributed back into it.
e) Lower the preference of the redistributed external routes on both border routers, so they are chosen ahead of the native routes consistently.
 
03. On a manufacturer's two-datacentre WAN, an engineer applies a policy on the datacentre-A edge router so that traffic sourced from the test-lab subnet leaves over a dedicated circuit, while everything else uses the primary link. The change behaves as intended.
A colleague checking the same router afterwards finds the routing table listing the primary link as the best path to the destinations the test lab is reaching, yet test-lab traffic is demonstrably leaving over the dedicated circuit. The colleague concludes that the routing table is faulty.
Which explanation accounts for what the colleague is seeing?
a) The policy is inactive, and equal-cost load sharing across the two links is what sends the traffic over the dedicated circuit.
b) Policy-based routing has put its own entries into the table, and the ones the colleague read are just the entries it did not touch.
c) Matched packets are forwarded to the policy's next hop before the destination lookup runs, so the table does not describe their path.
d) Routing has not converged since the change, so the table still shows a previous best path toward those destinations.
 
04. A university's IS-IS area 49.0010 contains two Level-1-2 routers, Bldg-N and Bldg-S, both attached to the Level-2 backbone. A Level-1 router, Lab-3, sits two hops from Bldg-N and six hops from Bldg-S. A destination outside the area is one backbone hop beyond Bldg-S, but many backbone hops beyond Bldg-N.
How does Lab-3 forward to that destination, and why is the result suboptimal?
a) It has no Level-1 route that fits and no default at all, so traffic is dropped at once.
b) It requests the Level-2 LSPs that it lacks, so traffic leaves by Bldg-S and the backbone portion stays short.
c) It compares the metric attached to each ATT bit, so traffic leaves by Bldg-S in spite of the longer path.
d) It follows the default toward the nearest router setting the ATT bit, so traffic leaves by Bldg-N and doubles back.
 
05. On a bank's inter-branch core, a router has traffic queued for a directly attached IPv6 host and none of it is being forwarded. A neighbour cache entry for that host exists but carries no link-layer address, and the router is repeatedly transmitting solicitations for the target.
Which reading of the neighbour cache accounts for the stalled traffic?
a) The entry is in Incomplete, which means solicitation has gone unanswered, so no link-layer address has ever been recorded for the target.
b) The entry is in Reachable, which means the neighbour was confirmed very recently, so the fault must lie somewhere beyond this link rather than on it, and the investigation should move to the next hop toward the host.
c) The entry is in Stale, which holds a recorded link-layer address unused until traffic arrives, so forwarding resumes once the delay timer expires and reachability is re-tested in the background.
d) The entry is in Probe, which means unicast solicitation is confirming a known link-layer address, so the stall must be caused by a filter, and the queued traffic will drain once that filter is lifted.
 
06. Two routers on a point-to-point link between a hospital's datacentres are both configured as Level-1-2, and both hold a valid NET. A Level-2 adjacency comes up on the link and stays up, but no Level-1 adjacency ever forms.
What is the most likely cause?
a) The two routers have been given identical system IDs, which Level-2 tolerates but which Level-1 rejects outright.
b) No DIS was elected on the link, and a Level-1 adjacency cannot form until a DIS is holding the pseudonode.
c) The two NETs carry different area addresses, and a Level-1 adjacency requires the area addresses to match.
d) One router uses wide metrics and the other narrow, and a Level-1 adjacency requires the styles to match.
 
07. An engineer is reviewing a route-policy on a government WAN border router. The policy has three nodes, every node is in permit mode and carries if-match conditions, and the first two nodes also carry apply clauses.
Which two statements correctly describe how this policy treats the routes offered to it?
(Choose two.)
a) A route that satisfies no node's conditions is permitted unchanged, because apply clauses rather than node mode are what deny a route.
b) A route that matches none of the three nodes is denied, because a route-policy ends with an implicit deny of everything unmatched.
c) A route that satisfies a node's conditions is passed on to the next node as well, and the apply clauses of all three nodes accumulate.
d) A route that satisfies all of a permit node's if-match conditions has that node's apply clauses executed, and no later node is evaluated.
e) A route that fails one if-match condition of the first node is rejected at once, because that node's conditions govern the whole policy.
 
08. On a broadcast segment in a provincial government WAN, an access control list on Site-9 silently discards every CSNP the DIS sends. IIH and LSP packets pass normally in both directions, and every adjacency on the segment stays up.
Which two consequences follow?
(Choose two.)
a) The LSPs Site-9 originates still flood normally, so the rest of the segment converges while it alone diverges.
b) Adjacencies on the segment drop, because the CSNP carries the Level-1 hello function on broadcast media.
c) SPF is suppressed on Site-9, because a database that is never confirmed complete cannot be run against.
d) The DIS stops issuing the pseudonode LSP for the segment, because its own CSNPs are never being acknowledged.
e) Site-9 loses the database summary it compares against, so a missing LSP is never noticed or requested.
 
09. An engineering firm holds AS 65010 at two sites with no link between them. Each site runs an eBGP session to the same provider, AS 64500. Site A originates 198.51.100.0/24. The provider readvertises the prefix and Site B receives the update, but Site B never uses it and it is absent from the routing table there.
What is happening, and what would change it?
a) NEXT_HOP resolution fails at Site B; a static route toward the provider's address would make the path usable.
b) AS_PATH loop detection drops the update at Site B; an internal path or a session permitting the local AS is needed.
c) ORIGIN checking rejects the update at Site B; matching the origin code at Site A and at Site B would make the path usable.
d) The MED value discards the update at Site B; clearing it at the provider or at Site A would let the path win.
 
10. Four OSPF routers share a broadcast segment on a university backbone. Core-2 is the designated router and Core-3 is the backup. Core-1 was rebuilt last week; it now carries the highest interface priority on the segment and also the highest router ID, and its interfaces and adjacencies are all up.
Nevertheless Core-1 reports itself as DROther, and the operator can find no configuration error.
What accounts for this?
a) The election favours the lowest router ID whenever candidates present equal priority, so Core-1's unusually high router ID is what disqualifies it from either role on this broadcast segment.
b) Interface priority is advisory only, the router ID alone settles the outcome, and Core-2 must in fact be carrying a higher router ID than the rebuilt Core-1 is currently reporting.
c) A router that has already formed an adjacency with an existing designated router is barred from the role itself until every neighbour on the segment is renumbered and the adjacencies are rebuilt.
d) The election is non-preemptive, so an established designated router keeps the role even when a better candidate appears later, and Core-1 stays DROther until the current holder leaves.

Solutions:

Question: 01

Answer: b

Question: 02

Answer: c, d

Question: 03

Answer: c

Question: 04

Answer: d

Question: 05

Answer: a

Question: 06

Answer: c

Question: 07

Answer: b, d

Question: 08

Answer: a, e

Question: 09

Answer: b

Question: 10

Answer: d

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