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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. OSPF: how do you change the cost of an interface for OSPF?
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
DCE

2. What is the Data-Link PDU called?
1-65535
Frames
Layer 2
Every 64 ip's

3. What are the commands to setup SSH?
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
Packets
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)#hostname R1 - R1(config)#line VTY 0 4 - R1(config-line)#login local - R1(config-line)#transport input telnet ssh - R1(config-line)#exit - R1(config)#username {user} password {pass} - R1(config)#ip domain-name {domainname} - R1(config)#

4. What gets the clock rate - DCE or DTE?
DCE
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
Layer 2
110

5. What is the Network PDU called?
Switch forwards the frame as soon as it can
Packets
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

6. What is Layer 3 in the OSI Model?
Network
Application
110
Router(config)#ip route {exit-interface}

7. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Session
62 per network
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.
R3(config)#router rip - R3(config-router)#network 192.168.1.2

8. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/9
126 per network
1-65535

9. Symbol for Rip on a Show ip route
255.255.192.0
Switch forwards the frame as soon as it can
R
Router(config)#hostname R1 - R1(config)#line VTY 0 4 - R1(config-line)#login local - R1(config-line)#transport input telnet ssh - R1(config-line)#exit - R1(config)#username {user} password {pass} - R1(config)#ip domain-name {domainname} - R1(config)#

10. What is the layer 4 PDU called?
120
Segments
Application
14 per network

11. What Layer does CDP operate at?
60
Bandwidth - Delay - reliability and Load
1-65535
Layer 2

12. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
1-65535
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Bellman-Ford

13. Subnetting: where do the networks break with a /28

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14. Rip: how do hold down timers work?
60
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
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

15. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
255.255.255.252
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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

16. Subnetting: What is a 255.255.252.0 in prefix notation
/22
/9
100
2 hosts

17. How many Collision domains are there on a with 1 hub and 2 computers?
Shortest path first - (SPF)
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
1 - everything hooked to the hub is in the same collision domain
DCE

18. EIGRP: What is the range of Autonomous System numbers?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
/24
1-65535
Show ip eigrp topology

19. OSPF: What is the default administrative distance?
Hop Count
D
110
Router(config)#ip route {network address} {subnet-mask}

20. Symbol for EIGRP on a Show ip route
R
Segments
120
D

21. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Every 16 ip's
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Show ip eigrp topology
R3(config)#router rip - R3(config-router)#network 192.168.1.2

22. Subnetting: What is a /30 in Decimal
IEEE 802.3u
255.255.0.0
255.255.255.252
Every 64 ip's

23. RIP Timers: What is an Flush Timer?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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.

24. CABLES: What is the difference between T568A and T568B?
D
Pins 1+2 swap places with pins 3+6
30 per network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

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

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26. Subnetting: What is a /27 in Decimal
Every 128 ip's
Show ip eigrp topology
Segments
255.255.255.224

27. What is the layer 2 PDU called?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Frames
Every 4 ip's
Add the magic number to the network minus 1

28. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
IEEE 802.3z
Packets
Every 128 ip's

29. Using the magic number how to you figure the network?
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.
Closest multiple of the magic number that is not over the interesting octets number.
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
DCE

30. OSPF: What Algorithm is used?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
180
30 per network
Shortest path first - (SPF)

31. Rip Timers: How long is the default for Invalid timer.
180 seconds
1 - everything hooked to the hub is in the same collision domain
255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Segments
255.255.0.0
126 per network

33. Subnetting: What is a 255.255.255.0 in prefix notation
255.255.255.252
Show ip eigrp topology
/24
D

34. IEEE Standards: Ethernet
Frames
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R
IEEE 802.3

35. Subnetting: What is a /18 in Decimal
Layer 2
30 per network
180
255.255.192.0

36. What is the metric for RIP
R
Hop Count
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

37. Rip: What is the command to enable Ripv2?
Every 4 ip's
Every 64 ip's
Presentation
R1(config)#router rip - R1(config-router)#version 2

38. Subnetting: What is a /16 in Decimal
255.255.0.0
Every 32 ip's
Frames
/9

39. IEEE Standards: Gibabit Ethernet (Fibre)
Pins 1+2 swap places with pins 3+6
Router(config)#ip route {exit-interface}
IEEE 802.3z
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

40. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
Every 128 ip's
255.255.0.0
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

41. CABLES: What is the T568B Pinout Standard?
Closest multiple of the magic number that is not over the interesting octets number.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)#ip route {exit-interface}

42. Switching Methods: What is Fragment-free?
180 seconds
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
IEEE 802.3

43. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Router(config)#ip route {network address} {subnet-mask}

44. Rip Timers: How long is the default for Flush timer.
255.255.255.224
62 per network
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
60

45. What is the layer 3 PDU called?
Packets
180 seconds
Application
Hop Count

46. IEEE Standards: Fast Ethernet
DCE
126 per network
IEEE 802.3u
Presentation

47. What is Layer 1 in the OSI Model?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Physical
60
R3(config)#router rip - R3(config-router)#network 192.168.1.2

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

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49. OSPF: What is the process used by OSPF to build a routing table (step by step)
R1(config)#router rip - R1(config-router)#version 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
62 per network
120

50. Rip: Command to prevent rip updates on an interface
100
R
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)# router rip - Router(config-router)# passive-interface fa0/0