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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. CABLES: What is the difference between T568A and T568B?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Data-Link
Pins 1+2 swap places with pins 3+6
180 seconds

2. What is the Transport PDU called?
2 hosts
Segments
IEEE 802.3u
2 - each port is it's own collision domain

3. EIGRP: How do you view if there are any successor routes?
IEEE 802.3z
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Show ip eigrp topology
1 - everything hooked to the hub is in the same collision domain

4. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
2 - each port is it's own 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
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

5. Rip: What does v2 have that v1 does not?
Hop Count
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Every 16 ip's

6. Rip: What causes a triggered update?
IEEE 802.3
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Data-Link

7. Rip and EIGRP use what to keep other routers aware of their status?
Periodic Updates of their routing table
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
D
Frames

8. Rip Timers: How long is the default for Holddown timer.
180
Data-Link
2 hosts
Closest multiple of the magic number that is not over the interesting octets number.

9. CABLES: What is the T568A Pinout Standard?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
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.
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#router rip - R1(config-router)#version 2

10. 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)#
2 hosts
255.255.255.224
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.

11. Switching Methods: What is Fragment-free?
Segments
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
R1(config)#router rip - R1(config-router)#version 2
Router(config)#ip route {network address} {subnet-mask}

12. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
Segments
/9
Packets

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

14. Name the TCP/IP Layers
Packets
255.255.255.224
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Data-Link

15. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
2 - the bridge separates the collision domain
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

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

17. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
255.255.0.0
R
Network

18. EIGRP: What packet is used to search for networks?
1-65535
110
Presentation
Query and other router responds with a REPLY packet.

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

20. RIP Timers: What is an invalid Timer?
D
Session
Segments
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.

21. Subnetting: What is a /30 in Decimal
255.255.255.252
1-65535
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

22. Subnetting: What is a /25 in Decimal
Every 64 ip's
255.255.255.128
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Bandwidth - Delay - reliability and Load

23. OSPF: What Algorithm is used?
Shortest path first - (SPF)
14 per network
Every 128 ip's
Show ip eigrp topology

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

25. RIP: What is the default Administrative Distance?
120
14 per network
Router(config)#ip route {exit-interface}
Application

26. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
255.255.255.252
1-65535
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

27. Subnetting: What is a /27 in Decimal
Bellman-Ford
Packets
255.255.255.224
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

28. What is the metric for EIGRP
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Segments
Show ip eigrp topology
Bandwidth - Delay - reliability and Load

29. EIGRP: What is the hello packet used for?
IEEE 802.3
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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.
120

30. 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
Periodic Updates of their 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.
R

31. Rip: Command to prevent rip updates on an interface
Packets
1-65535
1 - everything hooked to the hub is in the same collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
110
14 per network
IEEE 802.3u
Presentation

33. What are the comands to set the clock rate in a serial connection?
Network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3ab
R3(config)#router rip - R3(config-router)#network 192.168.1.2

34. EIGRP: What is the range of Autonomous System numbers?
180 seconds
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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.
1-65535

35. What is Layer 6 in the OSI Model?
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)#
255.255.0.0
Hop Count
Presentation

36. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Pins 1+2 swap places with pins 3+6
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Frames
Segments

37. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
255.255.255.224
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
2 hosts
R1(config)#router rip - R1(config-router)#version 2

38. Using the magic number how to you figure the network?
/28
255.255.255.252
D
Closest multiple of the magic number that is not over the interesting octets number.

39. What is Layer 7 in the OSI Model?
60
Application
Frames
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

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

41. Symbol for Rip on a Show ip route
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R
Application
Every 32 ip's

42. RIP Timers: What is an Holddown Timer?
Router(config)#ip route {exit-interface}
255.255.255.128
Packets
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

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

44. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
255.255.255.224
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
62 per network
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)#

45. Switching Methods: What is Store and Forward?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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)#
IEEE 802.3

46. Rip: What is the command to enable Ripv2?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3u
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

47. RIP: What Algorithm is used in RIP>
Bellman-Ford
Segments
IEEE 802.3u
IEEE 802.3

48. CABLES: What is the T568B Pinout Standard?
Every 16 ip's
2 hosts
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Query and other router responds with a REPLY packet.

49. Command for a static route with 'Next Hop' Address
IEEE 802.3u
Router(config)#ip route {network address} {subnet-mask}
255.255.255.224
Switch forwards the frame as soon as it can

50. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
Shortest path first - (SPF)
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
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