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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 255.255.255.192
Switch forwards frame once it completely receives it
/24
62 per network
Every 16 ip's

2. CABLES: What is the T568A Pinout Standard?
R1(config)#router rip - R1(config-router)#version 2
/22
IEEE 802.3u
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

3. 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
Every 16 ip's
Segments
Network

4. OSPF: What Algorithm is used?
180
IEEE 802.3ab
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Shortest path first - (SPF)

5. EIGRP: What is the default administrative distance?
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3z
100
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

6. What is the layer 2 PDU called?
Frames
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.
Every 16 ip's
Query and other router responds with a REPLY packet.

7. What is the Network PDU called?
Packets
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
2 - each port is it's own collision domain
R

8. Rip: Command to prevent rip updates on an interface
Router(config)#ip route {network address} {subnet-mask}
Frames
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
30 per network

9. What is Layer 4 in the OSI Model?
DCE
255.255.255.224
Frames
Transport

10. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
126 per network
Hop Count

11. What is the metric for RIP
/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
Every 16 ip's
Hop Count

12. Subnetting: What is a /18 in Decimal
Router(config)#ip route {exit-interface}
Frames
Switch forwards the frame as soon as it can
255.255.192.0

13. What is the layer 3 PDU called?
Frames
Packets
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Switch forwards the frame as soon as it can

14. Symbol for EIGRP on a Show ip route
60
D
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

15. Name the TCP/IP Layers
60
Network
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.128

16. Subnetting: What is a 255.255.255.0 in prefix notation
/24
180 seconds
Data-Link
Shortest path first - (SPF)

17. Subnetting: What is a /27 in Decimal
Closest multiple of the magic number that is not over the interesting octets number.
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
/28
255.255.255.224

18. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
14 per network
Hop Count
Every 128 ip's
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

19. OSPF: What does OSPF use for its metric?
Data-Link
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Show ip eigrp topology
180

20. What is Layer 2 in the OSI Model?
Show ip eigrp topology
Every 4 ip's
Data-Link
110

21. What is Layer 6 in the OSI Model?
Network
2 hosts
Presentation
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)#

22. OSPF: how do you change the cost of an interface for OSPF?
IEEE 802.3u
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

23. Subnetting: What is a 255.255.252.0 in prefix notation
Application
/22
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
DCE

24. Subnetting: What is a 255.255.255.240 in prefix notation
100
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
/28
1-65535

25. Rip and EIGRP use what to keep other routers aware of their status?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Periodic Updates of their routing table
126 per network
R

26. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
Hop Count
Layer 2
62 per network

27. CABLES: What is the T568B Pinout Standard?
180
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

28. IEEE Standards: Gibabit Ethernet (Copper)
Bandwidth - Delay - reliability and Load
Periodic Updates of their routing table
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
IEEE 802.3ab

29. CABLES: What is the difference between T568A and T568B?
255.255.0.0
Pins 1+2 swap places with pins 3+6
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Hop Count

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
/28
255.255.0.0
2 hosts
Every 32 ip's

31. What is Layer 3 in the OSI Model?
Network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Physical
Transport

32. What are the comands to set the clock rate in a serial connection?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
126 per network
DCE
Closest multiple of the magic number that is not over the interesting octets number.

33. Rip: What is the command to enable Ripv2?
255.255.0.0
R1(config)#router rip - R1(config-router)#version 2
Every 4 ip's
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.

34. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
62 per network
Add the magic number to the network minus 1
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
DUAL: Difusing Update Algorithm

35. Subnetting: What is a 255.128.0.0 in prefix notation
Query and other router responds with a REPLY packet.
255.255.192.0
Segments
/9

36. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
1-65535
Presentation
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

37. RIP: What Algorithm is used in RIP>
DCE
Shortest path first - (SPF)
Bellman-Ford
Data-Link

38. OSPF: What is the default administrative distance?
Transport
110
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3

39. What are the commands to setup SSH?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Switch forwards frame once it completely receives it
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)#

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

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41. Command for a static route with 'Next Hop' Address
100
Router(config)#ip route {network address} {subnet-mask}
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
Layer 2

42. OSPF: What is the process used by OSPF to build a routing table (step by step)
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
R
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
DUAL: Difusing Update Algorithm
126 per network

44. Switching Methods: What is Store and Forward?
120
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
R3(config)#router rip - R3(config-router)#network 192.168.1.2

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

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46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
DUAL: Difusing Update Algorithm
Shortest path first - (SPF)
2 - each port is it's own collision domain
14 per network

47. IEEE Standards: Gibabit Ethernet (Fibre)
Shortest path first - (SPF)
D
Hop Count
IEEE 802.3z

48. RIP Timers: What is an Holddown Timer?
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
Bandwidth - Delay - reliability and Load
60
180 seconds

49. Rip Timers: How long is the default for Flush timer.
60
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.
Pins 1+2 swap places with pins 3+6
30 per network

50. Rip Timers: How long is the default for Invalid timer.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
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)#
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
180 seconds