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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: What Algorithm is used in RIP>
Bellman-Ford
Every 64 ip's
Session
Shortest path first - (SPF)

2. RIP Timers: What is an invalid Timer?
IEEE 802.3ab
Application
255.255.255.224
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.

3. What is Layer 3 in the OSI Model?
Add the magic number to the network minus 1
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Network

4. Subnetting: What is a /18 in Decimal
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
/22
Segments
255.255.192.0

5. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
IEEE 802.3u
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

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)#
255.255.255.224
IEEE 802.3z
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

7. Rip: Command to prevent rip updates on an interface
R1(config)#router rip - R1(config-router)#version 2
1 - everything hooked to the hub is in the same collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 8 ip's

8. What are the comands to set the clock rate in a serial connection?
14 per network
1 - everything hooked to the hub is in the same collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

9. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Data-Link
120
60
126 per network

10. IEEE Standards: Ethernet
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Segments

11. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
62 per network
255.255.192.0

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

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13. Subnetting: What is a 255.255.252.0 in prefix notation
1 - everything hooked to the hub is in the same collision domain
Show ip eigrp topology
/22
Bellman-Ford

14. What is the layer 4 PDU called?
Every 32 ip's
Segments
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3u

15. Subnetting: What is a /30 in Decimal
Data-Link
2 - each port is it's own collision domain
255.255.255.252
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

16. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
255.255.255.252
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {network address} {subnet-mask}
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

17. IEEE Standards: Gibabit Ethernet (Copper)
/22
Frames
IEEE 802.3ab
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

18. What is Layer 4 in the OSI Model?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Transport
IEEE 802.3ab
/28

19. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Switch forwards frame once it completely receives it
2 hosts
2 - the bridge separates the collision domain
14 per network

20. What is the metric for RIP
Hop Count
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.
100
Data-Link

21. What is Layer 1 in the OSI Model?
180
Bellman-Ford
Pins 1+2 swap places with pins 3+6
Physical

22. What is Layer 6 in the OSI Model?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Every 4 ip's
Presentation
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.

23. What gets the clock rate - DCE or DTE?
DCE
IEEE 802.3z
Switch forwards the frame as soon as it can
120

24. Command for a static route with 'Next Hop' Address
Bandwidth - Delay - reliability and Load
2 - the bridge separates the collision domain
30 per network
Router(config)#ip route {network address} {subnet-mask}

25. What is the layer 2 PDU called?
14 per network
Frames
180 seconds
IEEE 802.3ab

26. Subnetting: What is a /27 in Decimal
255.255.255.224
14 per network
30 per network
Periodic Updates of their routing table

27. What is Layer 2 in the OSI Model?
Data-Link
180
Network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

28. What is the Network PDU called?
Show ip eigrp topology
255.255.0.0
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
Packets

29. Rip Timers: How long is the default for Flush timer.
60
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Segments
Query and other router responds with a REPLY packet.

30. RIP: What is the default Administrative Distance?
Bandwidth - Delay - reliability and Load
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)#ip route {exit-interface}
120

31. OSPF: What is the default administrative distance?
Periodic Updates of their routing table
110
/22
14 per network

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Packets
30 per network
Frames
Switch forwards frame once it completely receives it

33. Rip: What causes a triggered update?
Application
Switch forwards frame once it completely receives it
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

34. What is Layer 5 in the OSI Model?
/22
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
110
Session

35. Rip: What does v2 have that v1 does not?
Pins 1+2 swap places with pins 3+6
2 - the bridge separates the 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
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

36. Subnetting: What is a /25 in Decimal
255.255.255.128
Show ip eigrp topology
Every 16 ip's
30 per network

37. OSPF: What does OSPF use for its metric?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
IEEE 802.3
Every 16 ip's
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

38. IEEE Standards: Gibabit Ethernet (Fibre)
IEEE 802.3z
Presentation
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.255.252

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

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40. EIGRP: What is the range of Autonomous System numbers?
R1(config)#router rip - R1(config-router)#version 2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Every 8 ip's
1-65535

41. EIGRP: What is the hello packet used for?
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.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
IEEE 802.3ab

42. What is the Transport PDU called?
Every 8 ip's
Segments
14 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

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

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44. EIGRP: What is the default administrative distance?
100
Packets
180 seconds
Query and other router responds with a REPLY packet.

45. EIGRP: What packet is used to search for networks?
1-65535
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)#
Query and other router responds with a REPLY packet.
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

46. Switching Methods: What is Store and Forward?
Show ip eigrp topology
Switch forwards frame once it completely receives it
Application
Add the magic number to the network minus 1

47. Symbol for EIGRP on a Show ip route
Show ip eigrp topology
D
Packets
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

48. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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)#
Every 8 ip's
Hop Count
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

49. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Session
DCE
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

50. What Layer does CDP operate at?
Layer 2
Network
Every 16 ip's
Periodic Updates of their routing table