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CCENT

Instructions:

Answer 50 questions in 15 minutes.
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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. What is Layer 7 in the OSI Model?
2 - each port is it's own collision domain
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Application
Session

2. What is the Data-Link PDU called?
Frames
Every 4 ip's
1-65535
120

3. What is the layer 2 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Frames
Network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

4. What are the commands to setup SSH?
Hop Count
Segments
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)#
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.

5. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
2 - the bridge separates the collision domain

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

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

8. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
2 - the bridge separates the collision domain
Shortest path first - (SPF)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

9. EIGRP: How do you view if there are any successor routes?
Switch forwards frame once it completely receives it
110
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Show ip eigrp topology

10. IEEE Standards: Ethernet
IEEE 802.3z
Router(config)#ip route {exit-interface}
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3

11. Subnetting: What is a /30 in Decimal
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
255.255.255.252
255.255.255.128
Packets

12. Using the magic number how to you figure the broadcast?
DUAL: Difusing Update Algorithm
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Add the magic number to the network minus 1
Every 16 ip's

13. Symbol for EIGRP on a Show ip route
D
Every 8 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.255.128

14. OSPF: What does OSPF use for its metric?
Every 32 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
110
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

15. Switching Methods: What is Store and Forward?
/22
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.
Switch forwards frame once it completely receives it
Every 16 ip's

16. What is the layer 4 PDU called?
Segments
Packets
100
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

17. What Layer does CDP operate at?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/24
Layer 2
100

18. OSPF: how do you change the cost of an interface for OSPF?
255.255.0.0
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
2 - the bridge separates the collision domain
Show ip eigrp topology

19. Subnetting: What is a 255.255.255.0 in prefix notation
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.
IEEE 802.3ab
R
/24

20. Symbol for Rip on a Show ip route
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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
R

21. What is Layer 1 in the OSI Model?
Physical
60
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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

22. Subnetting: What is a /25 in Decimal
Every 64 ip's
DCE
255.255.255.128
1-65535

23. OSPF: What is the default administrative distance?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
110
Every 8 ip's
Every 4 ip's

24. RIP Timers: What is an Holddown Timer?
Pins 1+2 swap places with pins 3+6
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
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

25. RIP Timers: What is an Flush Timer?
2 hosts
IEEE 802.3ab
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.
R3(config)#router rip - R3(config-router)#network 192.168.1.2

26. What gets the clock rate - DCE or DTE?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
DCE
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Periodic Updates of their routing table

27. Command for a static route with exit interface
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
100
Router(config)#ip route {exit-interface}
2 hosts

28. What is the layer 3 PDU called?
180 seconds
Router(config)#ip route {exit-interface}
62 per network
Packets

29. Command for a static route with 'Next Hop' Address
255.255.255.252
Router(config)#ip route {exit-interface}
62 per network
Router(config)#ip route {network address} {subnet-mask}

30. OSPF: What is the process used by OSPF to build a routing table (step by step)
2 hosts
Bellman-Ford
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.224

31. What is the Transport PDU called?
IEEE 802.3ab
/22
Router(config)#ip route {exit-interface}
Segments

32. What is Layer 4 in the OSI Model?
180
Frames
Transport
1 - everything hooked to the hub is in the same collision domain

33. EIGRP: What is the default administrative distance?
DCE
100
IEEE 802.3ab
D

34. Rip Timers: How long is the default for Invalid timer.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
180 seconds
/9
Application

35. IEEE Standards: Gibabit Ethernet (Copper)
Network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3ab
Segments

36. Rip Timers: How long is the default for Flush timer.
255.255.0.0
2 - the bridge separates the collision domain
60
Every 64 ip's

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

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

39. RIP: What is the default Administrative Distance?
Frames
120
Bellman-Ford
Segments

40. CABLES: What is the difference between T568A and T568B?
Packets
Shortest path first - (SPF)
Transport
Pins 1+2 swap places with pins 3+6

41. Subnetting: What is a /27 in Decimal
Segments
Switch forwards the frame as soon as it can
255.255.255.224
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

42. Subnetting: What is a 255.128.0.0 in prefix notation
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1-65535
Presentation
/9

43. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
255.255.255.252
IEEE 802.3ab
/28
R3(config)#router rip - R3(config-router)#network 192.168.1.2

44. What is the metric for RIP
Every 128 ip's
Hop Count
Periodic Updates of their routing table
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

45. What is the Network PDU called?
Packets
30 per network
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

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
100
126 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

47. Subnetting: What is a /18 in Decimal
180 seconds
Every 128 ip's
255.255.192.0
Data-Link

48. EIGRP: What is the name of the algorithm used for EIGRP?
62 per network
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
DUAL: Difusing Update Algorithm

49. Subnetting: What is a 255.255.252.0 in prefix notation
Periodic Updates of their routing table
/22
110
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

50. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
Bellman-Ford
126 per network
Router(config)#ip route {network address} {subnet-mask}