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CCNP SP english WARISSON GOMES > ISIS > Flashcards

ISIS Flashcards

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1
Q

What is the maximum and minimum length of the NET address

A

Maximum 20 bytes, minimum 8 bytes

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2
Q

What are the two levels of adjacency?

A

L1 and L2

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3
Q

Cisco IOS supports ISIS virtual link

A

False

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4
Q

In level 1 redistribution is allowed

A

True

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5
Q

Is Level 1 equivalent to OSPF stub area?

A

False, because in the stub area there are no external routes, Level 1 is equivalent to Totally not so stub area: Default route, Intra routes, Redistributed routes

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6
Q

In practice the L1/L2 router does not announce default route at level 1

A

True, it only sets the attached bit in the Link state Packets LSP

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7
Q

In the L1/L2 router there are two LSDBs, by default 1 per level

A

True

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8
Q

In a network with routers configured as default, SPF is executed only once

A

False, by default routers are L1/L2 so SPF is executed once for each level

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9
Q

L1 routes leak to L2 but L2 routes do not leak to L1 by default

A

True

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10
Q

ISIS supports the same types of interfaces as OSPF

A

False, only Broadcast and P2P

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11
Q

ISIS elects DIS and Backup DIS

A

False, there is no backup DIS

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12
Q

Once DIS is elected there is the possibility of preemption

A

True, it occurs by high priority of the interface, or by SNPA which is basically the MAC address of the ISIS process

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13
Q

Only one election occurs for both levels

A

False, two

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14
Q

DIS is elected on both types of interfaces

A

False, only in Broadcast

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15
Q

Adjacencies do not form in IP IP tunnels

A

True

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16
Q

Areas must match only in L2 adjacencies

A

False, in L1 areas

17
Q

ISIS forms adjacencies on links of different network types

A

False

18
Q

ISIS forms adjacencies on links of different MTU types

A

False

19
Q

Default link cost is 10 and L2 routes are preferred over L1 routes

A

True, False

20
Q

Metric style wide is default and required for MPLS TE

A

False, narrow. True

21
Q

TLVs are used to encode metrics

A

True

22
Q

ISIS by default does not support MPLS TE

A

True, due to narrow metrics

23
Q

In case of metric style mismatch the adjacency does not come up

A

False, it comes up but the routes are not processed and do not appear in the RIB

24
Q

Metric style wide is mandatory for IPv6 support

A

True

25
Q

Neighbors running single and multi topology are compatible

A

False, adjacencies come up in IPv4 the routes are okay but the IPv6 routes are not

26
Q

In single topology it is possible to have different costs for IPv6 and IPv4

A

False, in multitopology

27
Q

In multitopology SPF is calculated twice

A

True

28
Q

The NET address 00.0000.0000.0001.00 is invalid

A

False, it is valid

29
Q

Passive interface lo0 without the ip router isis command allows the interface to be advertised

A

True

30
Q

Check the syntax redistribute isis level-2 into level-1 route-map PERMIT-ANY

A

missing ip parameter as below: redistribute isis ip level-2 into level-1 route-map PERMIT-ANY

31
Q

4 types of PDUs

A

•Hello PDU o ESH - End System Hello - Announces End Systems to an Intermediate system o ISH - Intermediate system Hello - Announces an Intermediate System (routers) to an End System o IS-IS Hello - Announcement between IS IS for adjacency formation • LSP PDU - Used to distribute link-state information • PSNP - Partial Sequence Number PDU - Used to ack missing parts of link state information • CSNP - Complete Sequence Number PDU :: Used to describe a complete list of LSP in the LSDB of a router

32
Q

LSP on P2P links are sent as ______, on broadcast networks are sent as _______

A

Unicast, Broadcast

33
Q

Level 1 and Level 2 adjacencies are not maintained via IIH o Default interval: ____ for non-DIS IS o For DIS the hello timer is ____ faster  To quickly detect DIS failures

A

10s, 3x

34
Q

If an LSP is valid and newer than the current one in the LSDB then it is accepted and timer set to ____ secs The timer is decremented sec by sec, when the value reaches 0 it is held for another ___ secs before being distributed as expired

A

1200, 60

35
Q

2 types of Sequence Number PDUs (SNPs): _____  Contains a summary of the entire LSDB  Routers exchange CSNP to compare their LSDBs  Periodically multicast every 10 Secs by the DIS on the LAN  On ptp links they are sent only initially after that only update LSPs which are acked by ______ o ______  Contains only a subset of LSP entries (like DBD?)  Are used to request transmission of missing or new LSPs

A

CSNP, PSNP, PSNP

36
Q

In single Topology the router does a consistent check and if the router does not have both address families configured then the v6 prefixes are not exchanged

A

True

CCNP SP english WARISSON GOMES (41 decks)

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