Routers A and B&#819...

单项选择题Routers A and B have an OC12c and a GE link between them and are running OSPF over both of these links.Which item is correct， assuming the default JUNOS software OSPF metric calculation？（）

A.There are two equal cost paths between A and B
B.The GE link is the preferred path between A and B
C.The OC12c link is the preferred path between A and B
D.Manual metric assignment must be configured to determine the outcome.

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1.多项选择题You want to limit the number of Type 7 LSAs to be converted into Type 5 LSAs at an appropriate ARB. Which two commands should you use from the [edit] hierarchy level within the JUNOS software configuration mode？（）

A.set protocols ospf area-range network/mask-length
B.set protocols ospf area area-id nssa area-range network/mask-length
C.set protocols ospf area area-id area-range network/mask-length restrict
D.set protocols ospf area area-id nssa area-range network/mask-length restrict

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2.单项选择题 Given the topology displayed in the exhibit.

All links have an OSPF metric of 10.The link between Router A and Router B is in area 0.0.0.0. All other links are in area 0.0.0.1.What does Router A do with packets destined for Network Z？（）

A.Forwards them to Router B
B.Forwards them to Router C
C.Detects a routing loop and discards them.
D.Forwards them to Router B and Router C alternately.

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3.单项选择题Which LSA is used in JUNOS software when a OSPF router restarts？（）

A.LSA Type 6
B.LSA Type 9
C.LSA Type 10
D.LSA Type 11

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4.多项选择题In which two ways can the router ID selection be controlled？（）

A.Manually assign RID
B.Configure local-address
C.Enable the fxp0 interface
D.Assign nonmartian address to lo0.

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5.单项选择题In JUNOS software， which would prevent an OSPF router from importing the 10.0.0.4/30 summary route？（）

A.Import policies are not allowed， so this is not possible.
B.Export policies are not allowed， so this not possible.
C.Apply a firewall filter matching 10.0.0./4/30 and reject the route.
D.Apply an import policy matching 10.0.0.4/30 and reject the route.

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6.单项选择题What is a function of the OSPF Type 7 LSA？（）

A.It describes the reachability of routes in stub areas.
B.It describes the reachability of routes in totally-stubby areas.
C.It describes the reachability of routes in not-so-stubby areas.
D.It describes the reachability of routes in partially-stubby areas.

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7.多项选择题Which three authentication options does IS-IS support？（）

A.MD5
B.DES
C.Kerberos
D.Unauthenticated
E.Simple password

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8.多项选择题Which four components make up the Network Entity Title （NET） of an IS-IS router？（）

A.AF
B.AFI
C.MAC
D.Area
E.SysID
F.A-Selector
G.N-Selector
H.IP-address

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9.单项选择题Routers A and B are connected with a point-to-point OC-3 interface. Each router’s OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in different areas.How many IS-IS adjacencies exist between the two routers？（）

A.0
B.1
C.2
D.3

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10.单项选择题In IS-IS， how does the restarting router inform its helpers that a restarts event occurred？（）

A.Sending out a graceful restart PDU
B.Sending an LSP that contains no TLVs.
C.Sending out a restarts TLV with the RR bit set.
D.Reflooding its LSP with a maximum sequence number.

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