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CCENT

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. What is the layer 3 PDU called?
Router(config)#ip route {exit-interface}
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets
180 seconds

2. OSPF: What Algorithm is used?
255.255.192.0
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Shortest path first - (SPF)
Query and other router responds with a REPLY packet.

3. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
1 - everything hooked to the hub is in the same collision domain
Query and other router responds with a REPLY packet.
F an update has not been received to refresh an existing route after 180 seconds (the default) - the route is marked as invalid by setting the metric to 16. The route is retained in the routing table until the flush timer expires.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

4. What is the Transport PDU called?
R
IEEE 802.3
This timer stabilizes routing information and helps prevent routing loops during periods when the topology is converging on new information. Once a route is marked as unreachable - it must stay in holddown long enough for all routers in the topology
Segments

5. EIGRP: What is the range of Autonomous System numbers?
1-65535
Frames
Router(config)#ip route {exit-interface}
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

6. OSPF: how do you change the cost of an interface for OSPF?
Packets
Session
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Bandwidth - Delay - reliability and Load

7. Symbol for Rip on a Show ip route
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/9
R
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

8. EIGRP: How do you view if there are any successor routes?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Layer 2
Show ip eigrp topology
Query and other router responds with a REPLY packet.

9. How do you find the magic number for subnetting?
Every 8 ip's
Every 128 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

10. EIGRP: What is the name of the algorithm used for EIGRP?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
DUAL: Difusing Update Algorithm
Frames
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

11. Rip Timers: How long is the default for Flush timer.
60
255.255.0.0
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Pins 1+2 swap places with pins 3+6

12. What is the layer 4 PDU called?
/28
Periodic Updates of their routing table
Segments
Every 8 ip's

13. Rip: Command to prevent rip updates on an interface
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Bellman-Ford
Every 128 ip's

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
IEEE 802.3z
180
180 seconds

15. CABLES: What is the T568B Pinout Standard?
R1(config)#router rip - R1(config-router)#version 2
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.255.252
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

16. What is the metric for RIP
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Hop Count
2 - the bridge separates the collision domain
2 - each port is it's own collision domain

17. EIGRP: What packet is used to search for networks?
Frames
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Query and other router responds with a REPLY packet.
62 per network

18. RIP: What is the default Administrative Distance?
Hop Count
120
2 - each port is it's own collision domain
Periodic Updates of their routing table

19. Subnetting: where do the networks break with a /30

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20. IEEE Standards: Ethernet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
2 hosts
IEEE 802.3
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

21. What is the boot sequence for Cisco Routers?
Every 128 ip's
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Frames

22. Rip: What is the command to enable Ripv2?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R1(config)#router rip - R1(config-router)#version 2
Packets
/24

23. CABLES: What is the difference between T568A and T568B?
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
R
Pins 1+2 swap places with pins 3+6
/28

24. Subnetting: where do the networks break with a /29

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25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Bandwidth - Delay - reliability and Load
Frames
126 per network

26. Subnetting: What is a 255.255.255.240 in prefix notation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R
IEEE 802.3ab
/28

27. Using the magic number how to you figure the broadcast?
Router(config)#ip route {network address} {subnet-mask}
Network
Add the magic number to the network minus 1
Frames

28. Subnetting: What is a 255.128.0.0 in prefix notation
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
/9
180 seconds
R1(config)#router rip - R1(config-router)#version 2

29. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Bellman-Ford
Query and other router responds with a REPLY packet.

30. What is Layer 5 in the OSI Model?
/9
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3ab
Session

31. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
126 per network
IEEE 802.3
R

32. Rip Timers: How long is the default for Holddown timer.
Frames
Segments
IEEE 802.3u
180

33. Rip: how do hold down timers work?
/24
1. Router receives update from neighbor indicating a route down - Router makes route as down and starts holddown timer - If router gets an update indicating route is back holddown is removed - If an update is received indicating route is down again i
Network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

34. Rip: What causes a triggered update?
Session
IEEE 802.3
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

35. RIP Timers: What is an invalid Timer?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
F an update has not been received to refresh an existing route after 180 seconds (the default) - the route is marked as invalid by setting the metric to 16. The route is retained in the routing table until the flush timer expires.
Presentation
Shortest path first - (SPF)

36. Command for a static route with exit interface
Network
Segments
14 per network
Router(config)#ip route {exit-interface}

37. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Transport
R
It adds the cost of each jump - R1 to R2 over a t1 is a cost of 64 - R2 to computer is a cost of 1. Total cost of route is 65

38. Subnetting: What is a 255.255.252.0 in prefix notation
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
1 - everything hooked to the hub is in the same collision domain
D
/22

39. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.255.252
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.

40. What is the metric for EIGRP
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
Bandwidth - Delay - reliability and Load
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Segments

41. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Show ip eigrp topology
1-65535
100
14 per network

42. RIP: What Algorithm is used in RIP>
Bellman-Ford
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
This timer stabilizes routing information and helps prevent routing loops during periods when the topology is converging on new information. Once a route is marked as unreachable - it must stay in holddown long enough for all routers in the topology
Periodic Updates of their routing table

43. What is the layer 2 PDU called?
60
/9
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

44. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
R1(config)#router rip - R1(config-router)#version 2
By default - the flush timer is set for 240 seconds - which is 60 seconds longer than the invalid timer. When the flush timer expires - the route is removed from the routing table.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

45. EIGRP: What packet is used to propagate routing information?
Bellman-Ford
1-65535
Every 128 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

46. What is the Network PDU called?
Every 64 ip's
Packets
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

47. What is Layer 3 in the OSI Model?
Frames
255.255.192.0
Every 128 ip's
Network

48. What is Layer 4 in the OSI Model?
2 hosts
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Transport

49. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Application
Every 64 ip's

50. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
DCE
Transport
R1(config)#router rip - R1(config-router)#version 2