Test your basic knowledge |

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: where do the networks break with a /27

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

2. Command for a static route with 'Next Hop' Address
Every 32 ip's
Router(config)#ip route {network address} {subnet-mask}
126 per network
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

3. Rip: What does v2 have that v1 does not?
60
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Presentation
126 per network

4. Using the magic number how to you figure the broadcast?
Presentation
Add the magic number to the network minus 1
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)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

6. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
D
30 per network
IEEE 802.3u

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

8. What is the Data-Link PDU called?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Frames

9. What is the boot sequence for Cisco Routers?
Every 4 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Periodic Updates of their routing table
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

10. CABLES: What is the T568B Pinout Standard?
R
2 - the bridge separates the collision domain
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

12. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
14 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Network

13. OSPF: What is the process used by OSPF to build a routing table (step by step)
30 per network
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Hop Count
Every 8 ip's

14. RIP Timers: What is an Holddown Timer?
Bandwidth - Delay - reliability and Load
Every 4 ip's
180 seconds
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

15. What is the metric for RIP
Hop Count
110
Segments
Every 128 ip's

16. OSPF: how do you change the cost of an interface for OSPF?
110
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 16 ip's

17. What is Layer 1 in the OSI Model?
Physical
110
1-65535
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

18. IEEE Standards: Gibabit Ethernet (Fibre)
/9
IEEE 802.3z
Application
Physical

19. RIP: What is the default Administrative Distance?
Switch forwards the frame as soon as it can
Bandwidth - Delay - reliability and Load
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
120

20. RIP Timers: What is an Flush Timer?
Layer 2
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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.
Hop Count

21. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
60
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
/28
2 - the bridge separates the collision domain

22. What is Layer 2 in the OSI Model?
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
DUAL: Difusing Update Algorithm
100
Data-Link

23. How do you find the magic number for subnetting?
Switch forwards frame once it completely receives it
62 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

24. What is the layer 3 PDU called?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Session
/24
Packets

25. What Layer does CDP operate at?
R1(config)#router rip - R1(config-router)#version 2
/24
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

26. Subnetting: What is a 255.255.255.240 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.
/28
2 - the bridge separates the collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

28. What gets the clock rate - DCE or DTE?
2 hosts
DCE
Switch forwards frame once it completely receives it
180

29. What is the layer 4 PDU called?
Segments
Every 4 ip's
Physical
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

30. Symbol for Rip on a Show ip route
R
255.255.255.224
30 per network
180

31. 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
14 per network
IEEE 802.3u
126 per network

32. What is the Transport PDU called?
Bellman-Ford
IEEE 802.3z
Segments
Packets

33. What is Layer 5 in the OSI Model?
Bellman-Ford
1-65535
Session
120

34. RIP Timers: What is an invalid Timer?
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
Frames
D

35. Using the magic number how to you figure the network?
Packets
Closest multiple of the magic number that is not over the interesting octets number.
Packets
255.255.0.0

36. Subnetting: What is a /18 in Decimal
255.255.192.0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
255.255.255.128
Add the magic number to the network minus 1

37. What is Layer 4 in the OSI Model?
100
1 - everything hooked to the hub is in the same collision domain
Transport
30 per network

38. Subnetting: What is a /27 in Decimal
255.255.255.224
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3
Every 32 ip's

39. Rip: how do hold down timers work?
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Frames
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
100

40. RIP: What Algorithm is used in RIP>
Bellman-Ford
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
180
Frames

41. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.128
Segments
D

42. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
/24
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
/9
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

43. EIGRP: What is the range of Autonomous System numbers?
Presentation
Session
180 seconds
1-65535

44. What are the comands to set the clock rate in a serial connection?
Bandwidth - Delay - reliability and Load
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {exit-interface}

45. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
/24
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
IEEE 802.3

46. OSPF: What Algorithm is used?
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Segments
Every 8 ip's

47. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
D
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 hosts
Packets

48. Rip Timers: How long is the default for Holddown timer.
Pins 1+2 swap places with pins 3+6
62 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
180

49. What is the metric for EIGRP
Presentation
Bandwidth - Delay - reliability and Load
/22
Show ip eigrp topology

50. Subnetting: What is a /30 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252
Every 64 ip's
180 seconds