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. IEEE Standards: Fast Ethernet
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Switch forwards frame once it completely receives it
IEEE 802.3u
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

2. What is Layer 5 in the OSI Model?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Session
100
Closest multiple of the magic number that is not over the interesting octets number.

3. Command for a static route with 'Next Hop' Address
Data-Link
255.255.255.252
Router(config)#ip route {network address} {subnet-mask}
255.255.255.128

4. EIGRP: What packet is used to propagate routing information?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
120
Bellman-Ford

5. 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

6. Rip: What is the command to enable Ripv2?
Segments
R1(config)#router rip - R1(config-router)#version 2
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Periodic Updates of their routing table

7. EIGRP: What is the name of the algorithm used for EIGRP?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.255.128
DUAL: Difusing Update Algorithm
Application

8. Rip: What does v2 have that v1 does not?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Packets
D
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

9. What is the Network PDU called?
100
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3
Packets

10. What is the layer 4 PDU called?
110
Data-Link
Segments
Layer 2

11. Subnetting: What is a 255.255.255.0 in prefix notation
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)#
Add the magic number to the network minus 1
/24
255.255.255.252

12. 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

13. Subnetting: What is a 255.255.255.240 in prefix notation
/28
255.255.0.0
255.255.255.252
14 per network

14. RIP Timers: What is an invalid Timer?
Shortest path first - (SPF)
Pins 1+2 swap places with pins 3+6
126 per network
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.

15. Rip and EIGRP use what to keep other routers aware of their status?
Segments
Router(config)#ip route {network address} {subnet-mask}
Periodic Updates of their routing table
/22

16. EIGRP: How do you view if there are any successor routes?
1-65535
Closest multiple of the magic number that is not over the interesting octets number.
Show ip eigrp topology
Frames

17. EIGRP: What is the default administrative distance?
Physical
Router(config)#ip route {network address} {subnet-mask}
30 per network
100

18. What is the Data-Link PDU called?
Frames
1-65535
255.255.255.128
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

19. How do you find the magic number for subnetting?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3ab
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

20. RIP Timers: What is an Flush Timer?
Switch forwards frame once it completely receives it
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.
1 - everything hooked to the hub is in the same collision domain
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

21. Using the magic number how to you figure the network?
2 hosts
Every 64 ip's
Closest multiple of the magic number that is not over the interesting octets number.
14 per network

22. Rip: Command to prevent rip updates on an interface
DUAL: Difusing Update Algorithm
Every 128 ip's
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 16 ip's

23. What is Layer 6 in the OSI Model?
60
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
/24
Presentation

24. IEEE Standards: Gibabit Ethernet (Copper)
180
Session
IEEE 802.3ab
Frames

25. EIGRP: What packet is used to search for networks?
1-65535
Every 32 ip's
Query and other router responds with a REPLY packet.
/9

26. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
180 seconds
Periodic Updates of their routing table
30 per network
1-65535

27. 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
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Shortest path first - (SPF)
D

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

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

29. What is the layer 3 PDU called?
Packets
Query and other router responds with a REPLY packet.
Show ip eigrp topology
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

30. 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

31. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Shortest path first - (SPF)
/28
DUAL: Difusing Update Algorithm

32. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
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.
/22
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
60

33. Rip: how do hold down timers work?
255.255.255.128
Closest multiple of the magic number that is not over the interesting octets number.
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
Pins 1+2 swap places with pins 3+6

34. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
2 hosts
2 - the bridge separates the collision domain
120

35. 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
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)#
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

36. What gets the clock rate - DCE or DTE?
R
DCE
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
180 seconds

37. Subnetting: What is a 255.255.252.0 in prefix notation
Packets
/22
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Hop Count

38. What is the layer 2 PDU called?
Query and other router responds with a REPLY packet.
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
180 seconds

39. Name the OSI Layers
180
IEEE 802.3
/24
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

40. 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
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/22
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

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

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

42. What is Layer 3 in the OSI Model?
Query and other router responds with a REPLY packet.
Network
Switch forwards the frame as soon as it can
2 hosts

43. IEEE Standards: Gibabit Ethernet (Fibre)
Show ip eigrp topology
IEEE 802.3z
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)#
120

44. Subnetting: What is a /27 in Decimal
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.
180
Network
255.255.255.224

45. Rip Timers: How long is the default for Flush timer.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
IEEE 802.3z
62 per network
60

46. What is the Transport PDU called?
Segments
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
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

47. What is the metric for RIP
Physical
Hop Count
120
Periodic Updates of their routing table

48. Switching Methods: What is Cut-through?
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 the frame as soon as it can
/22
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

49. 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

50. OSPF: What Algorithm is used?
Shortest path first - (SPF)
Query and other router responds with a REPLY packet.
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3u