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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. How many Collision domains are there on a with 1 switch 2 computers?

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2. OSPF: What Algorithm is used?
110
Query and other router responds with a REPLY packet.
Shortest path first - (SPF)
255.255.255.252

3. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3z
Every 128 ip's
IEEE 802.3ab
100

4. CABLES: What is the T568A Pinout Standard?
/24
R1(config)#router rip - R1(config-router)#version 2
Pins 1+2 swap places with pins 3+6
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

5. What is the layer 4 PDU called?
Every 128 ip's
Packets
Segments
/24

6. EIGRP: What packet is used to search for networks?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Physical
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
Query and other router responds with a REPLY packet.

7. What is Layer 2 in the OSI Model?
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
Data-Link
D
R1(config)#router rip - R1(config-router)#version 2

8. Rip Timers: How long is the default for Flush timer.
/9
60
Every 128 ip's
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

9. What is Layer 1 in the OSI Model?
Every 4 ip's
180 seconds
Segments
Physical

10. CABLES: What is the T568B Pinout Standard?
Add the magic number to the network minus 1
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
/28
110

11. What gets the clock rate - DCE or DTE?
255.255.192.0
Switch forwards frame once it completely receives it
DCE
Session

12. Subnetting: What is a 255.255.255.240 in prefix notation
1-65535
/28
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3

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

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14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
Periodic Updates of their routing table
2 - the bridge separates the collision domain
Bandwidth - Delay - reliability and Load

15. Using the magic number how to you figure the network?
Application
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
Hop Count
Closest multiple of the magic number that is not over the interesting octets number.

16. What is Layer 4 in the OSI Model?
Transport
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
62 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Every 4 ip's

18. Subnetting: What is a 255.128.0.0 in prefix notation
/9
2 - the bridge separates the collision domain
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Transport

19. CABLES: What is the difference between T568A and T568B?
2 - the bridge separates the collision domain
255.255.0.0
Pins 1+2 swap places with pins 3+6
62 per network

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

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21. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
255.255.255.128
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

22. Rip: Command to prevent rip updates on an interface
1 - everything hooked to the hub is in the same collision domain
Every 64 ip's
DUAL: Difusing Update Algorithm
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

23. Switching Methods: What is Cut-through?
Query and other router responds with a REPLY packet.
Switch forwards the frame as soon as it can
(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

24. What is Layer 6 in the OSI Model?
R
2 hosts
110
Presentation

25. RIP Timers: What is an Holddown Timer?
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
Bandwidth - Delay - reliability and Load
Periodic Updates of their routing table
Transport

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

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27. EIGRP: What is the default administrative distance?
100
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Pins 1+2 swap places with pins 3+6
Every 128 ip's

28. IEEE Standards: Gibabit Ethernet (Fibre)
DUAL: Difusing Update Algorithm
IEEE 802.3ab
Frames
IEEE 802.3z

29. RIP: What is the default Administrative Distance?
Shortest path first - (SPF)
Switch forwards the frame as soon as it can
120
255.255.192.0

30. Command for a static route with exit interface
Session
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Router(config)#ip route {exit-interface}
120

31. Subnetting: What is a /18 in Decimal
255.255.192.0
Closest multiple of the magic number that is not over the interesting octets number.
255.255.255.128
14 per network

32. EIGRP: What is the name of the algorithm used for EIGRP?
1-65535
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
255.255.255.252
DUAL: Difusing Update Algorithm

33. 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
2 - the bridge separates the collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
60

34. What is the metric for EIGRP
Shortest path first - (SPF)
Bandwidth - Delay - reliability and Load
Frames
Session

35. Subnetting: What is a /27 in Decimal
Physical
1-65535
/22
255.255.255.224

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

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

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38. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
1-65535
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
D

39. IEEE Standards: Ethernet
IEEE 802.3
110
Frames
Router(config)#ip route {network address} {subnet-mask}

40. Symbol for Rip on a Show ip route
Bandwidth - Delay - reliability and Load
255.255.192.0
R
255.255.255.224

41. Command for a static route with 'Next Hop' Address
Application
Router(config)#ip route {network address} {subnet-mask}
Bandwidth - Delay - reliability and Load
255.255.255.252

42. Rip: What does v2 have that v1 does not?
Router(config)#ip route {exit-interface}
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
60

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
IEEE 802.3z
Frames
Hop Count
126 per network

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
DCE
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)#
2 hosts

45. RIP Timers: What is an invalid Timer?
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.
Data-Link
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

46. OSPF: What is the process used by OSPF to build a routing table (step by step)
2 hosts
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

47. What is the metric for RIP
2 hosts
Hop Count
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
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

48. Symbol for EIGRP on a Show ip route
Segments
D
Data-Link
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

49. What is the layer 3 PDU called?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Data-Link
Add the magic number to the network minus 1
Packets

50. 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
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
/22