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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. EIGRP: What is the hello packet used for?
2 - each port is it's own collision domain
IEEE 802.3
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments

2. Subnetting: What is a /25 in Decimal
IEEE 802.3ab
Periodic Updates of their routing table
Every 128 ip's
255.255.255.128

3. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
Data-Link
/9
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

4. RIP: What Algorithm is used in RIP>
Bellman-Ford
IEEE 802.3
DCE
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

5. What is Layer 5 in the OSI Model?
Application
Session
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

6. OSPF: What is the process used by OSPF to build a routing table (step by step)
Application
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
/28
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

7. RIP Timers: What is an invalid Timer?
Every 128 ip's
Shortest path first - (SPF)
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.
100

8. What is the Data-Link PDU called?
R1(config)#router rip - R1(config-router)#version 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Frames
14 per network

9. Subnetting: What is a /27 in Decimal
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.
Every 32 ip's
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

10. 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
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
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

11. Command for a static route with exit interface
/22
/24
Router(config)#ip route {exit-interface}
Layer 2

12. EIGRP: How do you view if there are any successor routes?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Show ip eigrp topology
255.255.255.224
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

13. Rip: how do hold down timers work?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.255.224
Pins 1+2 swap places with pins 3+6
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

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

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

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

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17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Hop Count
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
126 per network
255.255.192.0

18. Rip Timers: How long is the default for Invalid timer.
62 per network
30 per network
DUAL: Difusing Update Algorithm
180 seconds

19. How many Collision domains are there on a with 1 hub and 2 computers?
255.255.0.0
1 - everything hooked to the hub is in the same collision domain
/24
Packets

20. 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
2 hosts
Every 4 ip's
Layer 2

21. EIGRP: What is the name of the algorithm used for EIGRP?
110
1-65535
DUAL: Difusing Update Algorithm
Layer 2

22. Rip and EIGRP use what to keep other routers aware of their status?
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
255.255.0.0
Periodic Updates of their routing table

23. What is the Transport PDU called?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
62 per network
1 - everything hooked to the hub is in the same collision domain
Segments

24. EIGRP: What is the range of Autonomous System numbers?
180 seconds
1-65535
/24
Router(config)#ip route {network address} {subnet-mask}

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Session
Every 32 ip's
2 - each port is it's own collision domain
14 per network

26. What gets the clock rate - DCE or DTE?
R1(config)#router rip - R1(config-router)#version 2
DCE
Periodic Updates of their routing table
120

27. Rip Timers: How long is the default for Holddown timer.
255.255.0.0
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
180

28. What is the layer 4 PDU called?
Router(config)#ip route {exit-interface}
Segments
180 seconds
60

29. Switching Methods: What is Cut-through?
Show ip eigrp topology
Packets
Switch forwards the frame as soon as it can
Data-Link

30. Subnetting: What is a /30 in Decimal
Switch forwards frame once it completely receives it
Application
255.255.255.252
1-65535

31. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Data-Link
30 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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.

32. What is Layer 3 in the OSI Model?
Add the magic number to the network minus 1
180 seconds
Segments
Network

33. OSPF: What is the default administrative distance?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
110
255.255.0.0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

34. What is Layer 4 in the OSI Model?
Show ip eigrp topology
255.255.0.0
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Transport

35. What are the commands to setup SSH?
Every 16 ip's
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)#
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3

36. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 16 ip's
Every 4 ip's
Every 8 ip's

37. IEEE Standards: Ethernet
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3
D
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. RIP Timers: What is an Holddown Timer?
Closest multiple of the magic number that is not over the interesting octets number.
180 seconds
R3(config)#router rip - R3(config-router)#network 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

39. Rip Timers: How long is the default for Flush timer.
Layer 2
60
Data-Link
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

40. What is the metric for EIGRP
62 per network
Bandwidth - Delay - reliability and Load
IEEE 802.3
/28

41. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3u
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)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

42. Subnetting: What is a /16 in Decimal
Segments
255.255.0.0
Periodic Updates of their routing table
R3(config)#router rip - R3(config-router)#network 192.168.1.2

43. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Every 4 ip's
Packets
Packets

44. Switching Methods: What is Fragment-free?
Application
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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.

45. Using the magic number how to you figure the network?
IEEE 802.3u
Add the magic number to the network minus 1
DCE
Closest multiple of the magic number that is not over the interesting octets number.

46. 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
R1(config)#router rip - R1(config-router)#version 2
60
14 per network

47. What is the layer 2 PDU called?
Every 32 ip's
2 - the bridge separates the collision domain
Frames
R3(config)#router rip - R3(config-router)#network 192.168.1.2

48. What is the boot sequence for Cisco Routers?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Packets
DCE

49. Subnetting: What is a /18 in Decimal
Every 8 ip's
255.255.192.0
DUAL: Difusing Update Algorithm
R3(config)#router rip - R3(config-router)#network 192.168.1.2

50. Rip: Command to prevent rip updates on an interface
120
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Physical
255.255.192.0