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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: How many hosts per network if the subnet mask is 255.255.255.240
Application
14 per network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Segments

2. What is the boot sequence for Cisco Routers?
Every 4 ip's
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Query and other router responds with a REPLY packet.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

3. Switching Methods: What is Fragment-free?
Every 16 ip's
DUAL: Difusing Update Algorithm
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Periodic Updates of their routing table

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

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5. CABLES: What is the difference between T568A and T568B?
Switch forwards the frame as soon as it can
Pins 1+2 swap places with pins 3+6
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
120

6. Rip: What does v2 have that v1 does not?
DUAL: Difusing Update Algorithm
1 - everything hooked to the hub is in the same collision domain
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
60

7. Subnetting: What is a /16 in Decimal
IEEE 802.3z
255.255.0.0
2 - each port is it's own collision domain
Switch forwards the frame as soon as it can

8. Subnetting: What is a 255.255.255.0 in prefix notation
1 - everything hooked to the hub is in the same collision domain
Hop Count
/24
IEEE 802.3u

9. What is Layer 7 in the OSI Model?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
255.255.0.0
Application
Router(config)#ip route {exit-interface}

10. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
126 per network
Switch forwards frame once it completely receives it
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

11. RIP Timers: What is an Holddown Timer?
255.255.192.0
180 seconds
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

12. What is the layer 2 PDU called?
Frames
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Every 64 ip's
255.255.192.0

13. Subnetting: What is a /27 in Decimal
Transport
110
R1(config)#router rip - R1(config-router)#version 2
255.255.255.224

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

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15. Rip: What is the command to enable Ripv2?
Show ip eigrp topology
/28
1 - everything hooked to the hub is in the same collision domain
R1(config)#router rip - R1(config-router)#version 2

16. What is Layer 5 in the OSI Model?
R1(config)#router rip - R1(config-router)#version 2
Session
Closest multiple of the magic number that is not over the interesting octets number.
R3(config)#router rip - R3(config-router)#network 192.168.1.2

17. IEEE Standards: Gibabit Ethernet (Copper)
Application
R1(config)#router rip - R1(config-router)#version 2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3ab

18. What is the layer 4 PDU called?
30 per network
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
255.255.255.128
Segments

19. What is the Data-Link PDU called?
Frames
Periodic Updates of their routing table
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

20. Subnetting: What is a /25 in Decimal
180
255.255.255.128
Data-Link
Transport

21. Symbol for EIGRP on a Show ip route
D
30 per network
Router(config)#ip route {network address} {subnet-mask}
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

22. What are the commands to setup SSH?
Periodic Updates of their routing table
1 - everything hooked to the hub is in the same collision domain
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)#
Network

23. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
R1(config)#router rip - R1(config-router)#version 2
Switch forwards the frame as soon as it can
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

24. Rip: how do hold down timers work?
2 - each port is it's own collision domain
255.255.0.0
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

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
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
60
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
2 hosts

26. Switching Methods: What is Store and Forward?
/22
IEEE 802.3ab
Switch forwards frame once it completely receives it
180

27. Subnetting: What is a /30 in Decimal
110
255.255.255.252
Bandwidth - Delay - reliability and Load
Every 4 ip's

28. What is the Transport PDU called?
R1(config)#router rip - R1(config-router)#version 2
Segments
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.
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

29. What is Layer 1 in the OSI Model?
Physical
2 - each port is it's own collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

30. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
255.255.0.0
R3(config)#router rip - R3(config-router)#network 192.168.1.2

31. Using the magic number how to you figure the network?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 16 ip's
Closest multiple of the magic number that is not over the interesting octets number.
Every 128 ip's

32. What is Layer 3 in the OSI Model?
Switch forwards the frame as soon as it can
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
Network
Packets

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

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34. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Frames
255.255.255.224
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
30 per network

35. EIGRP: What is the range of Autonomous System numbers?
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.
Closest multiple of the magic number that is not over the interesting octets number.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1-65535

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

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37. 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
Frames
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
Every 32 ip's

38. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Application
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
30 per network

39. IEEE Standards: Gibabit Ethernet (Fibre)
Bellman-Ford
IEEE 802.3z
Switch forwards frame once it completely receives it
Every 4 ip's

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

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41. Rip: What causes a triggered update?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
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
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
2 hosts

42. What is Layer 4 in the OSI Model?
/28
Transport
Query and other router responds with a REPLY packet.
255.255.255.252

43. OSPF: What Algorithm is used?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
DUAL: Difusing Update Algorithm
Shortest path first - (SPF)
14 per network

44. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
D

45. EIGRP: What packet is used to search for networks?
Router(config)#ip route {exit-interface}
Presentation
Query and other router responds with a REPLY packet.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

46. What is Layer 6 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/24
Presentation
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

47. What is Layer 2 in the OSI Model?
Data-Link
Every 128 ip's
Bellman-Ford
Bandwidth - Delay - reliability and Load

48. Using the magic number how to you figure the broadcast?
DUAL: Difusing Update Algorithm
Add the magic number to the network minus 1
255.255.192.0
2 - the bridge separates the collision domain

49. How do you find the magic number for subnetting?
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.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
R
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

50. Name the TCP/IP Layers
(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
IEEE 802.3z
30 per network