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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 Timers: How long is the default for Flush timer.
60
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
180
Every 8 ip's

2. Name the OSI Layers
255.255.255.128
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
2 hosts
Data-Link

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

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4. What is the layer 4 PDU called?
Segments
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {exit-interface}
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. Using the magic number how to you figure the broadcast?
Pins 1+2 swap places with pins 3+6
Segments
Add the magic number to the network minus 1
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

6. Subnetting: What is a 255.128.0.0 in prefix notation
Shortest path first - (SPF)
Every 32 ip's
/9
Session

7. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Frames
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 4 ip's
126 per network

8. What is Layer 2 in the OSI Model?
/9
Every 16 ip's
Every 4 ip's
Data-Link

9. What is the Transport PDU called?
Closest multiple of the magic number that is not over the interesting octets number.
Segments
Switch forwards frame once it completely receives it
Every 8 ip's

10. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R1(config)#router rip - R1(config-router)#version 2
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

11. RIP Timers: What is an Holddown 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.
Bellman-Ford
D
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

12. Subnetting: What is a 255.255.255.240 in prefix notation
/22
Every 8 ip's
255.255.255.252
/28

13. EIGRP: What is the default administrative distance?
255.255.192.0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
100

14. What is Layer 6 in the OSI Model?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Presentation
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
255.255.255.252

15. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Pins 1+2 swap places with pins 3+6
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

16. CABLES: What is the T568B Pinout Standard?
100
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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.
110

17. EIGRP: What is the range of Autonomous System numbers?
180
126 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1-65535

18. What are the comands to set the clock rate in a serial connection?
Layer 2
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Add the magic number to the network minus 1
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

19. Subnetting: What is a /18 in Decimal
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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
255.255.192.0

20. Subnetting: What is a /16 in Decimal
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Network
255.255.0.0
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

21. IEEE Standards: Gibabit Ethernet (Fibre)
Every 16 ip's
Closest multiple of the magic number that is not over the interesting octets number.
R
IEEE 802.3z

22. 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
Bellman-Ford
Network
Periodic Updates of their routing table

23. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Switch forwards frame once it completely receives it
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

24. CABLES: What is the T568A Pinout Standard?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 16 ip's

25. Subnetting: What is a 255.255.252.0 in prefix notation
180 seconds
/22
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/9

26. Rip and EIGRP use what to keep other routers aware of their status?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Packets
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Periodic Updates of their routing table

27. Subnetting: What is a /25 in Decimal
255.255.255.128
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
D

28. Name the TCP/IP Layers
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.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.192.0
D

29. What are the commands to setup SSH?
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)#
R1(config)#router rip - R1(config-router)#version 2
Segments
Session

30. OSPF: What is the default administrative distance?
DCE
Closest multiple of the magic number that is not over the interesting octets number.
110
Add the magic number to the network minus 1

31. Rip: how do hold down timers work?
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
126 per network
IEEE 802.3z
30 per network

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
2 hosts

33. OSPF: What is the process used by OSPF to build a routing table (step by step)
Bellman-Ford
Add the magic number to the network minus 1
IEEE 802.3z
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

34. IEEE Standards: Gibabit Ethernet (Copper)
/22
Every 64 ip's
IEEE 802.3ab
R3(config)#router rip - R3(config-router)#network 192.168.1.2

35. Rip Timers: How long is the default for Holddown timer.
180
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Transport
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

36. EIGRP: How do you view if there are any successor routes?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Bandwidth - Delay - reliability and Load
Show ip eigrp topology
D

37. What is Layer 3 in the OSI Model?
Periodic Updates of their routing table
Network
IEEE 802.3
60

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

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39. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
2 - each port is it's own collision domain
R
Closest multiple of the magic number that is not over the interesting octets number.
14 per network

40. IEEE Standards: Ethernet
IEEE 802.3
R1(config)#router rip - R1(config-router)#version 2
Application
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.

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

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42. What is the Network PDU called?
Periodic Updates of their routing table
Packets
255.255.192.0
14 per network

43. What is the layer 2 PDU called?
Frames
180
IEEE 802.3u
Bellman-Ford

44. RIP Timers: What is an invalid Timer?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/22
DCE
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. IEEE Standards: Fast Ethernet
Session
2 - the bridge separates the collision domain
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3u

46. 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.
Layer 2
62 per network
255.255.192.0

47. Switching Methods: What is Store and Forward?
Bandwidth - Delay - reliability and Load
2 - the bridge separates the collision domain
/22
Switch forwards frame once it completely receives it

48. Switching Methods: What is Fragment-free?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Periodic Updates of their routing table
DUAL: Difusing Update Algorithm

49. EIGRP: What packet is used to search for networks?
Application
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Query and other router responds with a REPLY packet.

50. What is Layer 5 in the OSI Model?
126 per network
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
2 - each port is it's own collision domain
Session