CCNA

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Spanning-Tree coast of 4
Null
Dijkstra's Algorithm
1Gb/s
...


2. What is an ABR
15.....16 hops and the interface is down
Packets are processed before they are routed to an outbound interface.
Area Border Router
A protocol on how to communicate with other routers


3. With OSPF - what must be defined?
DROTHER
A backbone area...Also known as Area 0
Scalable and fast convergence
Supports both unequal metric load balancing and equal metric balancing.


4. Formula for determining Subnets
4
2^n
Checks the source and destination address then permits or denies specific protocols
Private: link local


5. What is one to many?
110
Aka Subnet mask
Multicast
Domain


6. Wildcard masks filter

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7. Describe features of RIPv2
No
Classless - VLSM capable - Subnet mask sent in routing update - Multicast addressing - Supports route summarization - and authentication
Loopback
100Mb/s


8. The advantages of VLSM
Maximizing address efficiency - organization - summarization
20 seconds: 10 missed BPDU's
Multicast
One ACL per protocol - One ACL per direction - Once ACL per interface


9. What are the major components of OSPF troubleshooting?
224.0.0.5
Dijkstra's Algorithm
0
OSPF Neighbor adjacencies - OSPF routing table - and OSPF authentication


10. The time delay for a router to match a network change?
All backup routes for destinations.
Convergence
100Mb/s
It is a means for statistically multiplexing many logical data conversations also known as virtual circuits on a single physical transmission link.


11. What three types of IPv6 address types are there?
Data Link Connection Identifier
It is a means for statistically multiplexing many logical data conversations also known as virtual circuits on a single physical transmission link.
1Gb/s
Unicast - Multicast - Anycast


12. When do you use Access-Class
It is the signaling standard that maintains connection and statues between the DCE and DTE
It is never useful to send information about a route back in the direction from which the original info came.
For line vty 0 4
Is a classless link-state protocol - creates a neighbor relationship by exchanging hello packets - propagates LSA's rather than routing table updates.


13. Can you delete individual entries in a specific ACL?
100Mb/s
110
A group of end stations with a common set of requirements - independent of their physical location
Only with Cisco IOS software release 12.3 (2) T


14. Describe an Outbound ACL
120
Incoming packets are routed to the outbound interface - and then they are processed through the outbound ACL
224.0.0.10
The update only includes info about the route change


15. Describe features of RIPv1
Designated Router (DR) and a Back-up designated Router (BDR)
Supports both unequal metric load balancing and equal metric balancing.
Classful - No VLSM - Broadcast addressing - No route summarization - or Authentication
All backup routes for destinations.


16. What is OSPF multicast address?
Domain
16
224.0.0.5
RIPv2 and EIGRP


17. What is the dead interval
15.....16 hops and the interface is down
Cannot create - modify or delete VLAN's - sends and forwards advertisements - synchronizes VLAn configurations.
RIPv2 and EIGRP
Is the time in seconds that a router waits to hear from a neighbor before declaring the router out of service.


18. Problem with static routes
0
Not scalable - hard to maintain as the network grows
A link is an interface on a router
IETF


19. Explain OSPF

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20. Why is this done?
The Root bridge is the bridge with the lowest bridge ID
To reduce OSPF traffic
Test Firsts/ Routes Second
Creates - Modifies - and deletes VLAN's - Sends and forwards advertisements - Synchronizes VLAN configuration


21. The AS number must what?
Match on all routers or it will not work
1Gb/s
The inverse of a subnet mask.
Autonomous System


22. In regards to troubleshooting OSPF what should you check?
A combination of Link-state and distance vector
If int status is UP/UP..Check to make sure OSPF is enabled on the interface
Each router builds a map of the network and determines the shortest path to every network.
Cisco - ANSI - Q.933A


23. What is ::
Unspecified
A layer 3 switch or router
Creates - Modifies - and deletes VLAN's - Sends and forwards advertisements - Synchronizes VLAN configuration
100Mb/s


24. Admin distance of a connected Network?
Autonomous System
Determines the cost which is the bandwidth
0
1


25. What is the default load balancing for RIP
View
30-50 seconds
4
Advertised Distance & Feasible distance


26. What are non designated routers called?
Link-State
Unspecified
DROTHER
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.


27. How often are BPDU's sent?
Ever 2 seconds
Updates all DROTHER Routers when a change occurs
10Mb/s
120


28. How often are LMI's sent out?
Every 10 Seconds
224.0.0.5
Every 30 Seconds
Creates - Modifies - and deletes local VLAN's only - Forwards advertisements - Does not synchronize VLAN configs


29. Can a Router exchange routing information if they are using different Routing Protocols?
No
A single interface may be assigned multiple IPv6 addresses - and every IPv6 interface contains at least one loopback address.
Multicast
Advertised Distance & Feasible distance


30. How does Link-State work?
0
Creates - Modifies - and deletes local VLAN's only - Forwards advertisements - Does not synchronize VLAN configs
Only with Cisco IOS software release 12.3 (2) T
Each router builds a map of the network and determines the shortest path to every network.


31. Max_age time for BPDU's

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32. In regards to ACL's What are the three protocols?
Test Firsts/ Routes Second
...
Make sure you are in interface mode - then use this command ip access-group 1 out/in
One ACL per protocol - One ACL per direction - Once ACL per interface


33. How is the root bridge determined?
2^n
MAC based
The Root bridge is the bridge with the lowest bridge ID
Is the time in seconds that a router waits to hear from a neighbor before declaring the router out of service.


34. Break down the word Link-State

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35. What do area's do?
Reduce the link-state database and routing table
The lower MAC address
20 seconds: 10 missed BPDU's
Match on all routers or it will not work


36. How long is the dead interval
Multiple virtual interfaces that are associated with one physical interface
4 times the hello interval
1Gb/s
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.


37. Rip is capable of load balancing over as many as?
Between areas?
Six equal cost paths
Ever 2 seconds
The Diffusing Update Algorithm (DUAL)


38. What does the back bone router do?
Rouer OSPF 100 - then network xx.xx.xx.xx. area 0
Cisco - ANSI - Q.933A
Connects the different areas
Reduce the link-state database and routing table


39. With ACL's where does the router extract information
Associating the network address with a local DLCI.
Packet Header
Six equal cost paths
1


40. For a VLAN to span across multiple switches What is required?
Designated Router (DR) and a Back-up designated Router (BDR)
1.) Enter the Routing Manually 2.) Use Dymamic Routing
By insereting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address
A trunk


41. How often are periodic updates sent out via RIP
1.) Enter the Routing Manually 2.) Use Dymamic Routing
Convergence
Telnet connectivity - authentication and extended ACLs
Every 30 Seconds


42. Spanning-Tree cost of 19
Dijkstra's Algorithm
Inter-VLAN routing
100Mb/s
Packets are processed before they are routed to an outbound interface.


43. What does bounded refer to?
Forces protocols to behave as if they were classless
Updates all DROTHER Routers when a change occurs
Propagation of partial updates that are sent only to those routers that the changes affect.
It is the signaling standard that maintains connection and statues between the DCE and DTE


44. Why is it important to have a loopback address when using OSPF?
Because a loopback interface is always active and cannot be in a down state like a real interface can.
To reduce OSPF traffic
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.
All backup routes for destinations.


45. What does partial refer to?
By insereting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address
A group of end stations with a common set of requirements - independent of their physical location
The inverse of a subnet mask.
The update only includes info about the route change


46. How does an Extended ACL work?
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.
Plaintext and MD5
One ACL per protocol - One ACL per direction - Once ACL per interface
Checks the source and destination address then permits or denies specific protocols


47. What two classless protocols act classful by default?
Cannot create - modify or delete VLAN's - sends and forwards advertisements - synchronizes VLAn configurations.
110
RIPv2 & EIGRP
Advance Distance Vector


48. What are subinterfaces?
For line vty 0 4
Multiple virtual interfaces that are associated with one physical interface
Connects the different areas
Every 10 seconds


49. Routers are used for what?
To select the best path to the destination
Only with Cisco IOS software release 12.3 (2) T
Adjacency
Link-State


50. VTP Server Mode does what?

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