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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. EIGRP: What is the name of the algorithm used for EIGRP?
110
/28
Physical
DUAL: Difusing Update Algorithm

2. Command for a static route with exit interface
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 128 ip's
Router(config)#ip route {exit-interface}
/9

3. RIP Timers: What is an Holddown Timer?
Add the magic number to the network minus 1
60
Segments
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

4. What is Layer 3 in the OSI Model?
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.
Packets
Frames
Network

5. Rip Timers: How long is the default for Holddown timer.
180
Packets
255.255.255.128
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

6. 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)#
R1(config)#router rip - R1(config-router)#version 2
Packets
Presentation

7. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
1-65535
Bellman-Ford
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

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

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9. IEEE Standards: Gibabit Ethernet (Fibre)
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
180 seconds
IEEE 802.3z

10. EIGRP: What is the default administrative distance?
100
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
Physical

11. Rip: Command to prevent rip updates on an interface
14 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 4 ip's

12. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Bellman-Ford
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

13. Rip and EIGRP use what to keep other routers aware of their status?
255.255.255.128
126 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Periodic Updates of their routing table

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R
30 per network
Every 8 ip's

15. What is Layer 1 in the OSI Model?
Transport
180
Physical
Every 128 ip's

16. 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
Every 16 ip's
Data-Link
Frames

17. How do you find the magic number for subnetting?
100
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/9
Frames

18. IEEE Standards: Ethernet
Segments
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
180
IEEE 802.3

19. Rip: how do hold down timers work?
Bandwidth - Delay - reliability and Load
Every 32 ip's
Transport
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

20. Name the TCP/IP Layers
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
62 per network
/24

21. EIGRP: What is the hello packet used for?
/24
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Physical
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

22. Subnetting: What is a /18 in Decimal
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
255.255.192.0
R
180

23. Subnetting: What is a /16 in Decimal
Switch forwards the frame as soon as it can
Frames
Every 32 ip's
255.255.0.0

24. What is Layer 7 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
14 per network
Application
Bandwidth - Delay - reliability and Load

25. What is the Transport PDU called?
Packets
Every 8 ip's
Physical
Segments

26. What is the layer 4 PDU called?
255.255.255.128
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/28
Segments

27. IEEE Standards: Fast Ethernet
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
110
IEEE 802.3u
R1(config)#router rip - R1(config-router)#version 2

28. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Closest multiple of the magic number that is not over the interesting octets number.
Every 4 ip's
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Presentation

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

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30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Segments
14 per network
60
Query and other router responds with a REPLY packet.

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

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

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33. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Every 8 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards the frame as soon as it can
Pins 1+2 swap places with pins 3+6

34. RIP Timers: What is an Flush Timer?
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.
Every 16 ip's
14 per network
Shortest path first - (SPF)

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Layer 2
126 per network
Bellman-Ford
Packets

36. OSPF: What is the process used by OSPF to build a routing table (step by step)
Bandwidth - Delay - reliability and Load
Data-Link
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252

37. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1-65535
Periodic Updates of their routing table
180

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

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39. What is the Network PDU called?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Packets
Switch forwards the frame as soon as it can
Transport

40. Subnetting: What is a 255.128.0.0 in prefix notation
2 hosts
180 seconds
/9
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

41. What is Layer 2 in the OSI Model?
2 - each port is it's own collision domain
Data-Link
R
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

42. What are the comands to set the clock rate in a serial connection?
2 - the bridge separates the collision domain
2 hosts
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3z

43. What is the metric for EIGRP
D
/9
Network
Bandwidth - Delay - reliability and Load

44. What is Layer 4 in the OSI Model?
62 per network
Packets
Every 16 ip's
Transport

45. Subnetting: What is a /30 in Decimal
Physical
Add the magic number to the network minus 1
255.255.255.252
DCE

46. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
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.
Data-Link
180

47. Rip: What is the command to enable Ripv2?
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Hop Count
R1(config)#router rip - R1(config-router)#version 2

48. What Layer does CDP operate at?
Closest multiple of the magic number that is not over the interesting octets number.
Layer 2
120
/24

49. 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
Session
Every 32 ip's

50. OSPF: What does OSPF use for its metric?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
180 seconds
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1