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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: where do the networks break with a /25

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2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Switch forwards the frame as soon as it can
Transport
Shortest path first - (SPF)

3. What is Layer 3 in the OSI Model?
Network
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.
R
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

4. What is Layer 5 in the OSI Model?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
/24
Session
Packets

5. Subnetting: What is a 255.128.0.0 in prefix notation
DCE
Presentation
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
/9

6. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Shortest path first - (SPF)
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
Segments
R1(config)#router rip - R1(config-router)#version 2

7. EIGRP: What packet is used to propagate routing information?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Shortest path first - (SPF)
Add the magic number to the network minus 1
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

8. What is Layer 1 in the OSI Model?
Physical
255.255.255.224
120
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

9. EIGRP: What is the hello packet used for?
255.255.0.0
Layer 2
Router(config)#ip route {exit-interface}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

10. Switching Methods: What is Cut-through?
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
D
Switch forwards the frame as soon as it can
R

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

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12. Symbol for Rip on a Show ip route
Packets
R
1-65535
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

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

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14. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3
120
Application

15. What is the Transport PDU called?
D
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Segments

16. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Every 8 ip's
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)#
Transport

17. Rip Timers: How long is the default for Invalid timer.
180 seconds
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1-65535
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

18. Rip: how do hold down timers work?
100
Bellman-Ford
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
Query and other router responds with a REPLY packet.

19. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Segments
180
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

20. RIP: What is the default Administrative Distance?
IEEE 802.3u
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/28
120

21. What is Layer 2 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Data-Link
D
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

22. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Every 64 ip's
126 per network
Network

23. 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)#
255.255.192.0
Closest multiple of the magic number that is not over the interesting octets number.
Transport

24. Rip and EIGRP use what to keep other routers aware of their status?
2 hosts
Periodic Updates of their routing table
60
Application

25. What is the layer 4 PDU called?
Every 64 ip's
110
Application
Segments

26. Rip Timers: How long is the default for Flush timer.
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Every 32 ip's
60
255.255.255.252

27. IEEE Standards: Gibabit Ethernet (Fibre)
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3z

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

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29. CABLES: What is the T568A Pinout Standard?
Session
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 64 ip's

30. Name the TCP/IP Layers
62 per network
Every 128 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Frames

31. Subnetting: What is a /27 in Decimal
Frames
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
255.255.255.224

32. RIP Timers: What is an Holddown Timer?
Layer 2
DCE
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
255.255.255.252

33. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 hosts
2 - the bridge separates the collision domain
R
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

34. EIGRP: What is the range of Autonomous System numbers?
DCE
Segments
Bandwidth - Delay - reliability and Load
1-65535

35. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
1-65535
Frames
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

36. What is the boot sequence for Cisco Routers?
Switch forwards the frame as soon as it can
Network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
14 per network

37. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
255.255.192.0
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
255.255.255.128

38. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
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)#
Physical
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
30 per network

39. RIP: What Algorithm is used in RIP>
1 - everything hooked to the hub is in the same collision domain
255.255.192.0
Bellman-Ford
Bandwidth - Delay - reliability and Load

40. What is the metric for RIP
Hop Count
Transport
Every 64 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

41. CABLES: What is the difference between T568A and T568B?
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.
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.
Pins 1+2 swap places with pins 3+6
/22

42. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
D
255.255.0.0

43. IEEE Standards: Ethernet
DCE
/22
IEEE 802.3
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

44. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Layer 2
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
180 seconds

45. Subnetting: What is a 255.255.252.0 in prefix notation
14 per network
/22
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Network

46. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Physical
60
Application

47. How do you find the magic number for subnetting?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
IEEE 802.3ab

48. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
14 per network

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

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50. Subnetting: What is a /25 in Decimal
255.255.255.128
Query and other router responds with a REPLY packet.
2 hosts
IEEE 802.3