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. Describe a Inbound ACL
It is never useful to send information about a route back in the direction from which the original info came.
Multicast
Packets are processed before they are routed to an outbound interface.
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2. What does the DR do?
Updates all DROTHER Routers when a change occurs
Make sure trunking is established. Ensure that dot1q encapsulation is set - and then for each subinterface do this encapsulation dot1Q 2 where 2 is the VLAN associated with that interface
Bandwidth & Delay
Maximizing address efficiency - organization - summarization


3. How many hops are allowed with RIP?
EIGRP - OSPF - RIP
A single interface may be assigned multiple IPv6 addresses - and every IPv6 interface contains at least one loopback address.
It is a means for statistically multiplexing many logical data conversations also known as virtual circuits on a single physical transmission link.
15.....16 hops and the interface is down


4. An autonomous system could also be referred to as what?
224.0.0.10
Scalable and fast convergence
Domain
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5. Who designed OSPF?
Only with Cisco IOS software release 12.3 (2) T
...
IETF
A protocol on how to communicate with other routers


6. In frame relay What is Inverse Arp
Dijkstra's Algorithm
Associating the network address with a local DLCI.
10Mb/s
Routes First/ Tests second


7. What is a VLAN
MAC based
A group of end stations with a common set of requirements - independent of their physical location
Port based
Autonomous System


8. Admin distance of OSPF?
110
120
Updates all DROTHER Routers when a change occurs
Reduce the link-state database and routing table


9. In bridge root selection - if the bridge prioritys are the same - what determines root selection?
The lower MAC address
Incoming packets are routed to the outbound interface - and then they are processed through the outbound ACL
A permit statement
IETF


10. What is one to nearest
Convergence
Anycast
It is a means for statistically multiplexing many logical data conversations also known as virtual circuits on a single physical transmission link.
1


11. What algorithm does EIGRP use?
0
The Diffusing Update Algorithm (DUAL)
Link-State
The information regarding that link. This can include the router's IP address - the type of network - the cost of the link - and if there are any neighboring routers on that link.


12. What is the dead interval
Is the time in seconds that a router waits to hear from a neighbor before declaring the router out of service.
MD5 and you have to enable it if you want to use it.
Six equal cost paths
Make sure trunking is established. Ensure that dot1q encapsulation is set - and then for each subinterface do this encapsulation dot1Q 2 where 2 is the VLAN associated with that interface


13. What is the purpose of LMI
Classless - VLSM capable - Subnet mask sent in routing update - Multicast addressing - Supports route summarization - and authentication
It is the signaling standard that maintains connection and statues between the DCE and DTE
Different Autonomous Systems
TRUE


14. 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.
Link is the router interface and State is the description of an interface and it's relationship to neighboring routers
10Mb/s
R= Rip protocol; You can reach network 192.168.1.0 in two hops. The 120 is the admin distance and the 2 is the metric (hop). and it can be reached via the 10.1.1.2 network.


15. A router running EIGRP will store what?
TRUE
A trunk
A layer 3 switch or router
All backup routes for destinations.


16. With OSPF - what must be defined?
Automatically
A backbone area...Also known as Area 0
Associating the network address with a local DLCI.
Test Firsts/ Routes Second


17. Example of a Routing Protocol?
Plaintext and MD5
MAC based
EIGRP - OSPF - RIP
A combination of Link-state and distance vector


18. Purpose of a Routing Protocol?
Discovery of Remote Networks - Maintaining Up to date information - Choosing the best path available
Advertised Distance & Feasible distance
...
To select the best path to the destination


19. Why is this done?
Only with Cisco IOS software release 12.3 (2) T
Is the time in seconds that a router waits to hear from a neighbor before declaring the router out of service.
The inverse of a subnet mask.
To reduce OSPF traffic


20. What does a trunk do?

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21. What is an Autonomous System?
Creates - Modifies - and deletes local VLAN's only - Forwards advertisements - Does not synchronize VLAN configs
A group of end stations with a common set of requirements - independent of their physical location
...
A layer 3 switch or router


22. Routers are used for what?
View
Disable auto summarization
Determines the cost which is the bandwidth
To select the best path to the destination


23. Explain OSPF

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24. Explain how routing loops occur with RIP?
Inter-VLAN routing
...
Null
Disable auto summarization


25. Max_age time for BPDU's

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26. Routers running distances vector routing protocol send periodic updates even if there are no changes in the network. True or False?
TRUE
Cisco - ANSI - Q.933A
Supports both unequal metric load balancing and equal metric balancing.
Each router builds a map of the network and determines the shortest path to every network.


27. Describe features of RIPv1
It combines the advantages of Link-State and Distance vector routing protocols.
Autonomous System
Classful - No VLSM - Broadcast addressing - No route summarization - or Authentication
Is a classless link-state protocol - creates a neighbor relationship by exchanging hello packets - propagates LSA's rather than routing table updates.


28. Example of a Routed Protocol?
Make sure you are in interface mode - then use this command ip access-group 1 out/in
30-50 seconds
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.
IP


29. How is an EUI-64 format interface ID created from a 48-Bit MAC address
32768
...
30-50 seconds
By insereting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address


30. What three types of IPv6 address types are there?
Unicast - Multicast - Anycast
Propagation of partial updates that are sent only to those routers that the changes affect.
Every 30 Seconds
Every 5 seconds


31. What is an ABR
Area Border Router
1
Make sure you are in interface mode - then use this command ip access-group 1 out/in
Designated Router (DR) and a Back-up designated Router (BDR)


32. Spanning-Tree cost of 100
Automatically
MAC based
View
10Mb/s


33. In regards to troubleshooting OSPF what should you check?
Anycast
10Mb/s
Aka Subnet mask
If int status is UP/UP..Check to make sure OSPF is enabled on the interface


34. How often are BPDU's sent?
Place the extended ACL's as close to the source as possible and the standard ACL's as close to the destination as possible.
Telnet connectivity - authentication and extended ACLs
Individual or group IP's
Ever 2 seconds


35. What is needed to pass traffic from one VLAN to another?
A link is an interface on a router
A layer 3 switch or router
Scalable and fast convergence
Carry's traffic for multiple VLANS


36. The AS number must what?
Match on all routers or it will not work
Every 30 Seconds
90
0


37. Problem with RIP
Checks the source address and then permits or denies the entire protocol suite
Telnet connectivity - authentication and extended ACLs
DROTHER
Susceptible to routing loops


38. How is the root bridge determined?
The Root bridge is the bridge with the lowest bridge ID
Connects the different areas
30-50 seconds
It is the signaling standard that maintains connection and statues between the DCE and DTE


39. VTP Client Mode does what?

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40. What does the back bone router do?
Connects the different areas
Propagation of partial updates that are sent only to those routers that the changes affect.
Every 5 seconds
If int status is UP/UP..Check to make sure OSPF is enabled on the interface


41. How are Frame Relay Circuits identified?

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42. What does this mean? R 192.168.1.0/24 [120/2] via 10.1.1.2
Advertised Distance & Feasible distance
R= Rip protocol; You can reach network 192.168.1.0 in two hops. The 120 is the admin distance and the 2 is the metric (hop). and it can be reached via the 10.1.1.2 network.
Automatically
A group of end stations with a common set of requirements - independent of their physical location


43. Can a Router exchange routing information if they are using different Routing Protocols?
The lower MAC address
It is the signaling standard that maintains connection and statues between the DCE and DTE
No
Classless - VLSM capable - Subnet mask sent in routing update - Multicast addressing - Supports route summarization - and authentication


44. When do you use Access-Class
View
Disable auto summarization
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Link-State


45. Dynamic ACL's are dependent on what?
Telnet connectivity - authentication and extended ACLs
Checks the source and destination address then permits or denies specific protocols
All backup routes for destinations.
Routes First/ Tests second


46. How often are OSPF hello packets sent out?
Plaintext and MD5
Different Autonomous Systems
Every 10 seconds
Associating the network address with a local DLCI.


47. How often are periodic updates sent out via RIP
Area Border Router
Every 30 Seconds
Domain
2^n


48. How often does a router send link-state advertisements?
Multicast
Checks the source address and then permits or denies the entire protocol suite
4 times the hello interval
Every 30 minutes by default


49. What type of algorithm does EIGRP use?
Autonomous System
Six equal cost paths
Select the routing protocol - then specify the network.
Advance Distance Vector


50. What two classless protocols act classful by default?
RIPv2 & EIGRP
Every 10 Seconds
2^n-2
4