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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. RIP: What is the default Administrative Distance?
DUAL: Difusing Update Algorithm
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Layer 2
120

2. EIGRP: What is the name of the algorithm used for EIGRP?
Periodic Updates of their routing table
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Session
DUAL: Difusing Update Algorithm

3. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
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

4. Subnetting: What is a 255.255.255.240 in prefix notation
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Shortest path first - (SPF)
/28
255.255.255.128

5. Using the magic number how to you figure the network?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R
255.255.192.0
Closest multiple of the magic number that is not over the interesting octets number.

6. RIP Timers: What is an invalid Timer?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
IEEE 802.3z
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.

7. What gets the clock rate - DCE or DTE?
DCE
Query and other router responds with a REPLY packet.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

8. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
255.255.255.128
126 per network
IEEE 802.3

9. How do you find the magic number for subnetting?
Query and other router responds with a REPLY packet.
Router(config)#ip route {network address} {subnet-mask}
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

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

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11. What is the Data-Link PDU called?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - the bridge separates the collision domain
255.255.0.0
Frames

12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
255.255.0.0
R
Router(config)#ip route {network address} {subnet-mask}

13. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
IEEE 802.3u
62 per network

14. What is Layer 3 in the OSI Model?
Pins 1+2 swap places with pins 3+6
Router(config)#ip route {exit-interface}
Network
D

15. Subnetting: where do the networks break with a /27

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16. Name the OSI Layers
255.255.0.0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
2 - each port is it's own collision domain
60

17. EIGRP: How do you view if there are any successor routes?
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
Show ip eigrp topology
Application

18. Subnetting: What is a 255.255.255.0 in prefix notation
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 64 ip's
/24
Show ip eigrp topology

19. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
/9
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Frames

20. Subnetting: What is a /18 in Decimal
R1(config)#router rip - R1(config-router)#version 2
255.255.192.0
60
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

21. CABLES: What is the difference between T568A and T568B?
Every 32 ip's
Pins 1+2 swap places with pins 3+6
DUAL: Difusing Update Algorithm
Packets

22. Command for a static route with exit interface
Every 64 ip's
2 - the bridge separates the collision domain
Add the magic number to the network minus 1
Router(config)#ip route {exit-interface}

23. Subnetting: What is a 255.255.252.0 in prefix notation
/22
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.
Packets
Segments

24. What is the Network PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Packets

25. EIGRP: What packet is used to propagate routing information?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.192.0
126 per network
14 per network

26. Rip Timers: How long is the default for Flush timer.
60
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.
Packets
Switch forwards the frame as soon as it can

27. Rip Timers: How long is the default for Invalid timer.
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
180 seconds

28. Subnetting: What is a /16 in Decimal
255.255.0.0
14 per network
255.255.255.128
2 hosts

29. OSPF: how do you change the cost of an interface for OSPF?
/24
Closest multiple of the magic number that is not over the interesting octets number.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Every 64 ip's

30. Subnetting: What is a /25 in Decimal
62 per network
Query and other router responds with a REPLY packet.
Switch forwards the frame as soon as it can
255.255.255.128

31. EIGRP: What is the range of Autonomous System numbers?
IEEE 802.3ab
100
Bellman-Ford
1-65535

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

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33. What is the layer 2 PDU called?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Frames
/28
100

34. What is Layer 1 in the OSI Model?
Hop Count
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Physical
DUAL: Difusing Update Algorithm

35. Symbol for EIGRP on a Show ip route
180
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
110
D

36. Subnetting: What is a 255.128.0.0 in prefix notation
/9
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Router(config)#ip route {exit-interface}
Bellman-Ford

37. Rip and EIGRP use what to keep other routers aware of their status?
Hop Count
Periodic Updates of their routing table
Show ip eigrp topology
255.255.255.252

38. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Every 128 ip's
110
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.

39. CABLES: What is the T568B Pinout Standard?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Frames
Every 4 ip's
Data-Link

40. What is Layer 2 in the OSI Model?
1 - everything hooked to the hub is in the same collision domain
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Data-Link
180 seconds

41. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
D
Packets
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

42. RIP Timers: What is an Flush Timer?
30 per network
Physical
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.
255.255.255.252

43. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Layer 2
1 - everything hooked to the hub is in the same collision domain
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

44. OSPF: What is the default administrative distance?
110
R1(config)#router rip - R1(config-router)#version 2
180 seconds
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.

45. Subnetting: What is a /30 in Decimal
IEEE 802.3ab
255.255.255.252
Every 8 ip's
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
62 per network
30 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Switch forwards frame once it completely receives it

47. How many Collision domains are there on a with 1 hub and 2 computers?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1 - everything hooked to the hub is in the same collision domain
255.255.255.128
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

48. Rip: What does v2 have that v1 does not?
D
Closest multiple of the magic number that is not over the interesting octets number.
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
1-65535

49. OSPF: What does OSPF use for its metric?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Bellman-Ford
Transport
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

50. Rip: What causes a triggered update?
D
Segments
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical