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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. Subnetting: What is a 255.255.252.0 in prefix notation
Switch forwards frame once it completely receives it
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
/22
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

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

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3. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Router(config)#ip route {exit-interface}
255.255.255.252
Hop Count

4. Rip Timers: How long is the default for Holddown timer.
255.255.192.0
180
D
DCE

5. Subnetting: What is a 255.128.0.0 in prefix notation
/9
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Every 16 ip's
Session

6. What gets the clock rate - DCE or DTE?
IEEE 802.3z
DCE
Switch forwards frame once it completely receives it
Every 8 ip's

7. EIGRP: What packet is used to search for networks?
14 per network
100
Query and other router responds with a REPLY packet.
Every 16 ip's

8. Subnetting: What is a /16 in Decimal
1 - everything hooked to the hub is in the same collision domain
255.255.0.0
100
Switch forwards frame once it completely receives it

9. Subnetting: where do the networks break with a /25

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10. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
R
255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

11. Command for a static route with exit interface
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
180 seconds
Router(config)#ip route {exit-interface}
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

12. 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)#
126 per network
180 seconds
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

13. What is Layer 2 in the OSI Model?
Physical
Data-Link
Application
62 per network

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Query and other router responds with a REPLY packet.
Closest multiple of the magic number that is not over the interesting octets number.
Segments
2 hosts

15. What is the boot sequence for Cisco Routers?
Segments
Pins 1+2 swap places with pins 3+6
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Every 128 ip's

16. What is the Network PDU called?
Packets
D
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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.

17. RIP: What Algorithm is used in RIP>
/24
Bellman-Ford
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
2 - each port is it's own collision domain

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

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19. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
IEEE 802.3
/24
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R3(config)#router rip - R3(config-router)#network 192.168.1.2

20. CABLES: What is the T568B Pinout Standard?
D
/22
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Data-Link

21. Subnetting: What is a /27 in Decimal
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.255.224
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

22. Rip: how do hold down timers work?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

23. CABLES: What is the T568A Pinout Standard?
Periodic Updates of their routing table
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 32 ip's
30 per network

24. What is the Data-Link PDU called?
R
Every 16 ip's
Frames
Switch forwards frame once it completely receives it

25. Subnetting: What is a 255.255.255.240 in prefix notation
Segments
Physical
Frames
/28

26. Switching Methods: What is Cut-through?
255.255.255.224
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Switch forwards the frame as soon as it can
255.255.0.0

27. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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
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
Frames
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)#

28. EIGRP: What is the default administrative distance?
IEEE 802.3ab
120
1-65535
100

29. What is Layer 4 in the OSI Model?
62 per network
Transport
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 16 ip's

30. EIGRP: What is the hello packet used for?
255.255.255.128
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 4 ip's
Every 16 ip's

31. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
2 - the bridge separates the collision domain
100
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

32. Subnetting: What is a /18 in Decimal
/28
IEEE 802.3
Segments
255.255.192.0

33. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
Layer 2
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
60

34. EIGRP: How do you view if there are any successor routes?
255.255.192.0
Frames
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Show ip eigrp topology

35. What are the comands to set the clock rate in a serial connection?
255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Pins 1+2 swap places with pins 3+6

36. Rip Timers: How long is the default for Flush timer.
60
Application
Frames
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

37. 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
Every 128 ip's
Presentation
1-65535

38. What is Layer 1 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.
Physical
Bandwidth - Delay - reliability and Load
180

39. OSPF: What Algorithm is used?
Shortest path first - (SPF)
IEEE 802.3ab
255.255.255.224
Packets

40. Switching Methods: What is Fragment-free?
2 - each port is it's own collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.0.0
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

41. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.128
Layer 2
126 per network
Periodic Updates of their routing table

42. Using the magic number how to you figure the network?
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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Closest multiple of the magic number that is not over the interesting octets number.

43. What is Layer 6 in the OSI Model?
2 hosts
Presentation
R
Session

44. What is the layer 4 PDU called?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Segments
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)#
Layer 2

45. OSPF: What is the default administrative distance?
Shortest path first - (SPF)
110
/9
Add the magic number to the network minus 1

46. What is the metric for RIP
Hop Count
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
DCE
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

47. How many Collision domains are there on a with 1 hub and 2 computers?
Closest multiple of the magic number that is not over the interesting octets number.
1 - everything hooked to the hub is in the same collision domain
Presentation
255.255.192.0

48. What is Layer 5 in the OSI Model?
Session
255.255.255.224
Periodic Updates of their routing table
Network

49. Subnetting: What is a /30 in Decimal
180
/24
Bandwidth - Delay - reliability and Load
255.255.255.252

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

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