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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 hub and 2 computers?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
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 - everything hooked to the hub is in the same collision domain
255.255.255.224

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

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3. What is the metric for RIP
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Closest multiple of the magic number that is not over the interesting octets number.
Hop Count

4. Subnetting: What is a /16 in Decimal
D
DCE
255.255.0.0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

5. Subnetting: What is a /18 in Decimal
Bandwidth - Delay - reliability and Load
Switch forwards the frame as soon as it can
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
255.255.192.0

6. What is Layer 5 in the OSI Model?
Session
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
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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

7. 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
Switch forwards frame once it completely receives it
DCE
/9

8. OSPF: how do you change the cost of an interface for OSPF?
R
/22
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
255.255.255.128

9. RIP Timers: What is an Flush Timer?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
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.
D
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

10. Switching Methods: What is Store and Forward?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Switch forwards frame once it completely receives it
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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

11. Rip Timers: How long is the default for Holddown timer.
IEEE 802.3z
255.255.255.128
180
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

12. Switching Methods: What is Cut-through?
Presentation
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.
Switch forwards the frame as soon as it can
120

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

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14. Symbol for EIGRP on a Show ip route
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
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
DUAL: Difusing Update Algorithm
D

15. RIP Timers: What is an invalid Timer?
Frames
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.
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.
Application

16. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards the frame as soon as it can
R1(config)#router rip - R1(config-router)#version 2

17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
/24
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.224

18. Rip: What does v2 have that v1 does not?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
/22
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Every 4 ip's

19. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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
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)#
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.255.224

20. Subnetting: What is a /25 in Decimal
2 - the bridge separates the collision domain
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.255.128
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

21. What gets the clock rate - DCE or DTE?
Query and other router responds with a REPLY packet.
Add the magic number to the network minus 1
Every 64 ip's
DCE

22. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
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)#
Switch forwards frame once it completely receives it
/28

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

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24. CABLES: What is the difference between T568A and T568B?
14 per network
Session
Pins 1+2 swap places with pins 3+6
IEEE 802.3u

25. What is the Data-Link PDU called?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Session
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

26. What is Layer 6 in the OSI Model?
Pins 1+2 swap places with pins 3+6
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3z
Presentation

27. OSPF: What is the default administrative distance?
Router(config)#ip route {network address} {subnet-mask}
110
D
Every 4 ip's

28. What is the layer 2 PDU called?
Frames
2 - the bridge separates the collision domain
D
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

29. Rip: What causes a triggered update?
1 - everything hooked to the hub is in the same collision domain
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Application
Segments

30. What are the comands to set the clock rate in a serial connection?
Packets
IEEE 802.3z
14 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

31. What is Layer 7 in the OSI Model?
Switch forwards frame once it completely receives it
R
Application
Add the magic number to the network minus 1

32. CABLES: What is the T568A Pinout Standard?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
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
30 per network

33. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Query and other router responds with a REPLY packet.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R3(config)#router rip - R3(config-router)#network 192.168.1.2
110

34. EIGRP: What is the default administrative distance?
180 seconds
100
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Physical

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
30 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Every 4 ip's

36. Subnetting: What is a 255.255.252.0 in prefix notation
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.
110
100
/22

37. Rip Timers: How long is the default for Invalid timer.
Every 16 ip's
Bandwidth - Delay - reliability and Load
Every 4 ip's
180 seconds

38. EIGRP: What is the hello packet used for?
120
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3z

39. What is Layer 3 in the OSI Model?
Network
2 - the bridge separates the collision domain
R1(config)#router rip - R1(config-router)#version 2
Every 8 ip's

40. Subnetting: What is a 255.128.0.0 in prefix notation
Every 8 ip's
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
/9
Shortest path first - (SPF)

41. Rip: What is the command to enable Ripv2?
110
Every 64 ip's
Every 128 ip's
R1(config)#router rip - R1(config-router)#version 2

42. What Layer does CDP operate at?
Layer 2
R1(config)#router rip - R1(config-router)#version 2
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.
Query and other router responds with a REPLY packet.

43. OSPF: What Algorithm is used?
Shortest path first - (SPF)
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
2 - each port is it's own collision domain
255.255.255.128

44. RIP: What is the default Administrative Distance?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
120
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

45. Rip: how do hold down timers work?
Query and other router responds with a REPLY packet.
Every 128 ip's
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
Physical

46. Switching Methods: What is Fragment-free?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3z
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)#
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

47. What is the metric for EIGRP
126 per network
Data-Link
DCE
Bandwidth - Delay - reliability and Load

48. What is Layer 1 in the OSI Model?
Switch forwards frame once it completely receives it
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
Physical
Data-Link

49. EIGRP: How do you view if there are any successor routes?
Show ip eigrp topology
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
126 per network

50. Symbol for Rip on a Show ip route
Every 128 ip's
/9
IEEE 802.3ab
R