How many IS IS practice questions does Courseiva have?

Courseiva has 32 IS IS practice questions for the JNCIS-ENT exam.

What is the best way to practise IS IS questions?

Start with a short focused session to identify gaps, then work through explanations. Repeat with a longer session once the weak areas feel solid.

Can I practise only IS IS questions?

Yes — the session launcher on this page filters questions to this domain only. Choose any session length for inline explanations and scoring.

JNCIS-ENT · domain

IS IS

This domain covers IS-IS on Juniper devices: adjacency formation and levels, PDU and TLV types, link-state database inspection, metric styles, and route leaking between L1 and L2. JNCIS-ENT questions are operational and configuration-based, asking you to identify valid PDU types, select the correct Junos show command, and predict the effect of timers and metric changes.

32 questions9 easy17 medium6 hard

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What this domain covers

What to know about IS IS

Be able to identify IS-IS PDU and TLV types, run the right Junos show command to read the link-state database, and predict how lsp-lifetime and reference bandwidth change behavior. The key is knowing which PDU or timer does what before touching configuration.

Valid IS-IS PDU types: LSP, CSNP, PSNP, and IIH, including LAN versus point-to-point behavior.

Junos operational commands such as show isis database extensive to inspect TLVs and extended IP reachability.

LSP lifetime and refresh behavior configured with the lsp-lifetime statement and its effect on database aging.

Metric configuration including reference bandwidth, wide metrics, and route leaking between Level 1 and Level 2.

Watch out for

Common IS IS exam traps

▸Confusing PSNP and CSNP roles, or forgetting that IIH PDUs exist separately for LAN and point-to-point links.
▸Assuming lsp-lifetime sets how long an adjacency stays up rather than how long the router's own LSP remains valid.
▸Changing reference bandwidth without realizing it only affects metrics on interfaces using the default metric style, not explicit values.

Question index

All IS IS questions (32)

Click any question to see the full explanation, or start a practice session above.

A network administrator is configuring IS-IS on a Juniper router. They want to ensure that the router participates in both Level 1 and Level 2 routing. Which configuration statement is correct?

Easy 2

An administrator is configuring a new point-to-point link between two Junos routers running IS-IS. By default, how does IS-IS handle adjacency establishment on a point-to-point link compared to a broadcast link?

Medium 3

What happens if you have an area address mismatch in a Level 1 adjacency?

Medium 4

What is the purpose of the 'lsp-generation-interval'?

Easy 5

Which of the following are true regarding the IS-IS 'hello-interval'? (Choose TWO)

Medium 6

During an audit of an IS-IS routing network, an engineer examines the Type-Length-Value (TLV) structures used in IS-IS PDUs. Which TLV is specifically responsible for carrying IPv4 internal and external reachability information when using wide metrics?

Easy 7

During the examination of IS-IS packet captures on a multi-access LAN interface, an engineer notices a specific PDU type being transmitted periodically by the Designated Intermediate System (DIS) to maintain synchronized link-state databases. Which PDU type performs this function?

Easy 8

Which of the following are true regarding IS-IS authentication? (Choose TWO)

Medium 9

Which command is used to verify the IS-IS adjacency state on a Junos device?

Easy 10

You have a Level 1/Level 2 router connecting two areas. How does it advertise itself to Level 1 routers?

Medium 11

You are configuring IS-IS on a Juniper router and want to verify the adjacency state with a neighbor. You issue the command 'show isis adjacency'. The output shows the neighbor's system ID, interface, and state as 'Up'. However, you notice that the 'Holdtime' field is decreasing. What does this indicate?

Medium 12

Which of the following are valid IS-IS interface types? (Choose TWO)

Medium 13

You are configuring multi-topology IS-IS. What does this allow?

Hard 14

What does the 'show isis statistics' command reveal?

Medium 15

What happens if you have an LSP with an expired lifetime?

Medium 16

Which actions occur during an IS-IS SPF calculation? (Choose THREE)

Hard 17

What is the effect of changing the reference bandwidth in IS-IS?

Medium 18

Why would you set an interface to 'passive' in IS-IS?

Medium 19

Which level is enabled by default in Junos when configuring IS-IS on an interface?

Easy 20

In a multi-access network, which PDU is responsible for the DIS election?

Medium 21

Which TWO characteristics describe the behavior and properties of Level 1 and Level 2 routing in IS-IS? (Choose two)

Easy 22

How does an IS-IS router identify the DIS in its hello packets?

Hard 23

Which of the following is required for two routers to form a Level 2 adjacency?

Easy 24

When should you consider increasing the 'csnp-interval'?

Hard 25

Which command displays the IS-IS interface parameters?

Easy 26

Which of the following are valid IS-IS PDU types? (Choose THREE)

Medium 27

A network engineer wants to verify IS-IS link-state database entries, specifically checking for TLVs that carry extended IP reachability information with wide metrics. Which Junos operational command should be used?

Medium 28

An engineer is troubleshooting IS-IS adjacency formation failures on a Junos device. Which THREE parameters must match or be compatible between neighboring routers to successfully establish an IS-IS adjacency? (Choose three)

Medium 29

When using authentication in IS-IS, where can you apply the password?

Hard 30

What is the function of the DIS in an IS-IS broadcast network?

Medium 31

What is the purpose of the 'lsp-lifetime' command?

Hard 32

Which of the following are true about IS-IS Level-1 and Level-2 areas? (Choose TWO)

Medium

Other domains

All JNCIS-ENT exam domains

IS IS(current)

BGP Practice →

Spanning Tree Practice →

OSPF Practice →

High Availability Practice →

Protocol Independent Routing Practice →

Tunnels Practice →

Layer 2 Switching And VLANs Practice →

Layer 2 Security Practice →

Frequently asked questions

What does the IS IS domain cover on the JNCIS-ENT exam?: Be able to identify IS-IS PDU and TLV types, run the right Junos show command to read the link-state database, and predict how lsp-lifetime and reference bandwidth change behavior. The key is knowing which PDU or timer does what before touching configuration.
How many questions are in this domain?: This page lists all 32 IS IS questions in the JNCIS-ENT question bank. The actual exam draws from this domain proportionally to its weighting in the official exam blueprint.
What is the best way to practise this domain?: Start with a short focused session (10 questions) to identify gaps, then work through explanations. Repeat with a longer session once the weak areas feel solid.
Can I practise only IS IS questions?: Yes — the session launcher on this page filters questions to this domain only. Choose any session length for inline explanations and scoring.

Study guide

Read about IS IS

The JNCIS-ENT study guide for this domain covers everything tested on the real exam.

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IS IS BGP Spanning Tree OSPF High Availability Protocol Independent Routing Tunnels Layer 2 Switching And VLANs Layer 2 Security

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Each topic page collects the questions that test one concept, plus the theory behind it.

IS IS practice questions BGP practice questions Spanning Tree practice questions OSPF practice questions High Availability practice questions Protocol Independent Routing practice questions Tunnels practice questions Layer 2 Switching And VLANs practice questions Layer 2 Security practice questions JNCIS-ENT fundamentals practice questions

Common exam traps

•Confusing PSNP and CSNP roles, or forgetting that IIH PDUs exist separately for LAN and point-to-point links.
•Assuming lsp-lifetime sets how long an adjacency stays up rather than how long the router's own LSP remains valid.
•Changing reference bandwidth without realizing it only affects metrics on interfaces using the default metric style, not explicit values.

Where to go next

Practice IS IS questions JNCIS-ENT exam guide Study guide All JNCIS-ENT domains All JNCIS-ENT questions

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