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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 Layer 5 in the OSI Model?
Presentation
Router(config)#ip route {exit-interface}
R
Session

2. CABLES: What is the difference between T568A and T568B?
Data-Link
Pins 1+2 swap places with pins 3+6
2 - each port is it's own collision domain
255.255.255.224

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

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4. Subnetting: What is a 255.128.0.0 in prefix notation
/9
2 - each port is it's own collision domain
Layer 2
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.

5. RIP Timers: What is an invalid Timer?
/28
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.
Frames
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

6. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
255.255.255.224
120
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

7. How do you find the magic number for subnetting?
Application
62 per network
Every 64 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

8. What is the boot sequence for Cisco Routers?
Hop Count
Frames
1-65535
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

9. Using the magic number how to you figure the broadcast?
255.255.192.0
Switch forwards the frame as soon as it can
Add the magic number to the network minus 1
R1(config)#router rip - R1(config-router)#version 2

10. What is the Data-Link PDU called?
Every 64 ip's
Every 32 ip's
Every 128 ip's
Frames

11. Switching Methods: What is Cut-through?
180
/9
/28
Switch forwards the frame as soon as it can

12. What is Layer 7 in the OSI Model?
Application
Transport
Every 128 ip's
255.255.255.252

13. What is Layer 1 in the OSI Model?
120
IEEE 802.3u
Physical
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
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)#
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
60

15. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
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)#
Every 64 ip's

16. Subnetting: What is a 255.255.255.240 in prefix notation
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
/28
Layer 2
120

17. Subnetting: where do the networks break with a /26

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18. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.128
Application
Bandwidth - Delay - reliability and Load
126 per network

19. Subnetting: What is a /25 in Decimal
255.255.255.128
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1 - everything hooked to the hub is in the same collision domain
2 - each port is it's own collision domain

20. RIP: What is the default Administrative Distance?
Segments
180 seconds
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
120

21. What is the Transport PDU called?
/22
Closest multiple of the magic number that is not over the interesting octets number.
255.255.0.0
Segments

22. Rip: What does v2 have that v1 does not?
126 per network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Show ip eigrp topology
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.

23. Rip Timers: How long is the default for Flush timer.
255.255.255.224
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.
60
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

24. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R3(config)#router rip - R3(config-router)#network 192.168.1.2
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.224

25. Subnetting: What is a /27 in Decimal
255.255.255.224
Transport
R
Frames

26. RIP Timers: What is an Flush Timer?
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.
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.
Bandwidth - Delay - reliability and Load
DUAL: Difusing Update Algorithm

27. Symbol for Rip on a Show ip route
255.255.255.252
Every 4 ip's
R
IEEE 802.3u

28. Rip Timers: How long is the default for Holddown timer.
Hop Count
180
/9
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

29. What is Layer 2 in the OSI Model?
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
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.
D
Data-Link

30. CABLES: What is the T568B Pinout Standard?
30 per network
Pins 1+2 swap places with pins 3+6
120
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

31. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
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
126 per network
Pins 1+2 swap places with pins 3+6
14 per network

32. Using the magic number how to you figure the network?
110
255.255.0.0
/28
Closest multiple of the magic number that is not over the interesting octets number.

33. What is the layer 4 PDU called?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110
Segments
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

34. Rip: What causes a triggered update?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
2 - the bridge separates the collision domain
120
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

35. EIGRP: What is the range of Autonomous System numbers?
Every 16 ip's
1-65535
255.255.255.224
Every 32 ip's

36. What is the Network PDU called?
Packets
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.0.0

37. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
1-65535
30 per network
2 hosts
Every 16 ip's

38. Command for a static route with exit interface
Every 128 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)#ip route {exit-interface}
14 per network

39. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

40. OSPF: What Algorithm is used?
Shortest path first - (SPF)
120
255.255.0.0
Switch forwards the frame as soon as it can

41. Name the OSI Layers
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Every 16 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

42. Rip and EIGRP use what to keep other routers aware of their status?
Layer 2
Periodic Updates of their routing table
Show ip eigrp topology
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

43. EIGRP: How do you view if there are any successor routes?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments
Packets
Show ip eigrp topology

44. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Show ip eigrp topology
Presentation
2 - the bridge separates the collision domain

45. Subnetting: What is a 255.255.255.0 in prefix notation
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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.255.128
/24

46. What is Layer 3 in the OSI Model?
DCE
R1(config)#router rip - R1(config-router)#version 2
Network
Frames

47. What gets the clock rate - DCE or DTE?
1-65535
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
DCE

48. CABLES: What is the T568A Pinout Standard?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.252
180 seconds
Data-Link

49. How many Collision domains are there on a with 1 hub and 2 computers?
1 - everything hooked to the hub is in the same collision domain
Router(config)#ip route {network address} {subnet-mask}
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Segments

50. What is Layer 6 in the OSI Model?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Physical
Presentation
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database