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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: how do hold down timers work?
60
Network
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
/28

2. OSPF: What does OSPF use for its metric?
Every 32 ip's
Every 64 ip's
255.255.0.0
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

3. Command for a static route with exit interface
255.255.255.252
120
Router(config)#ip route {exit-interface}
Every 8 ip's

4. EIGRP: What is the name of the algorithm used for EIGRP?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Add the magic number to the network minus 1
126 per network
DUAL: Difusing Update Algorithm

5. OSPF: What is the process used by OSPF to build a routing table (step by step)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
120
Bandwidth - Delay - reliability and Load
Segments

6. IEEE Standards: Gibabit Ethernet (Fibre)
120
Hop Count
62 per network
IEEE 802.3z

7. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
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)#
Bellman-Ford
Packets

8. RIP: What Algorithm is used in RIP>
Transport
Presentation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Bellman-Ford

9. 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
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
Closest multiple of the magic number that is not over the interesting octets number.

10. Using the magic number how to you figure the network?
/24
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Closest multiple of the magic number that is not over the interesting octets number.
Every 16 ip's

11. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
255.255.192.0
Every 8 ip's
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
2 - the bridge separates the collision domain

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

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13. Subnetting: What is a /30 in Decimal
14 per network
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.255.252
IEEE 802.3ab

14. What is the layer 2 PDU called?
Frames
255.255.0.0
180
Hop Count

15. Subnetting: What is a 255.255.255.0 in prefix notation
180 seconds
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/24
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.

16. What gets the clock rate - DCE or DTE?
DCE
Physical
Every 16 ip's
Layer 2

17. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Data-Link
Physical

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

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19. Rip: What does v2 have that v1 does not?
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 64 ip's
Add the magic number to the network minus 1
255.255.0.0

20. Rip Timers: How long is the default for Invalid timer.
255.255.255.128
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Pins 1+2 swap places with pins 3+6
180 seconds

21. RIP: What is the default Administrative Distance?
Data-Link
Physical
Pins 1+2 swap places with pins 3+6
120

22. Name the OSI Layers
Segments
/24
1 - everything hooked to the hub is in the same collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

23. What is the layer 4 PDU called?
Every 128 ip's
Physical
IEEE 802.3
Segments

24. Symbol for EIGRP on a Show ip route
Segments
R1(config)#router rip - R1(config-router)#version 2
100
D

25. Rip Timers: How long is the default for Holddown timer.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
180
Every 16 ip's
Router(config)#ip route {exit-interface}

26. What is Layer 5 in the OSI Model?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Session
1-65535
Every 4 ip's

27. Subnetting: What is a 255.255.252.0 in prefix notation
/22
255.255.255.252
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 8 ip's

28. Switching Methods: What is Fragment-free?
255.255.192.0
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
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

29. OSPF: What Algorithm is used?
Router(config)#ip route {exit-interface}
Shortest path first - (SPF)
IEEE 802.3
126 per network

30. How do you find the magic number for subnetting?
Every 4 ip's
1 - everything hooked to the hub is in the same collision domain
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
2 - the bridge separates the collision domain

31. What is the layer 3 PDU called?
IEEE 802.3u
D
Packets
Bandwidth - Delay - reliability and Load

32. What is Layer 2 in the OSI Model?
Data-Link
Network
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)#
62 per network

33. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
D
126 per network
IEEE 802.3
Data-Link

34. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Presentation
Bandwidth - Delay - reliability and Load
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

35. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/9
D
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

36. IEEE Standards: Ethernet
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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

37. RIP Timers: What is an invalid Timer?
Every 16 ip's
R1(config)#router rip - R1(config-router)#version 2
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.
Bandwidth - Delay - reliability and Load

38. How many Collision domains are there on a with 1 hub and 2 computers?
Network
Segments
255.255.255.128
1 - everything hooked to the hub is in the same collision domain

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

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40. Rip Timers: How long is the default for Flush timer.
60
1-65535
Transport
Every 64 ip's

41. Symbol for Rip on a Show ip route
R
255.255.192.0
Presentation
Bellman-Ford

42. What is the Data-Link PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/22
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Frames

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Presentation
Packets
/9
2 hosts

44. What is the metric for RIP
Hop Count
120
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Add the magic number to the network minus 1

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

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46. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Frames
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

47. What Layer does CDP operate at?
Layer 2
Session
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
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

48. What is the Network PDU called?
Packets
Every 64 ip's
IEEE 802.3ab
1-65535

49. Name the TCP/IP Layers
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
/9
126 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

50. What is Layer 1 in the OSI Model?
/22
Segments
Router(config)#ip route {exit-interface}
Physical