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. What is the metric for EIGRP
/28
Closest multiple of the magic number that is not over the interesting octets number.
/22
Bandwidth - Delay - reliability and Load

2. Rip and EIGRP use what to keep other routers aware of their status?
1 - everything hooked to the hub is in the same collision domain
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.
Periodic Updates of their routing table
Bellman-Ford

3. 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)#
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
/24
Add the magic number to the network minus 1

4. What is the Network PDU called?
Packets
180
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Layer 2

5. EIGRP: What packet is used to search for networks?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
110
62 per network
Query and other router responds with a REPLY packet.

6. Subnetting: What is a /27 in Decimal
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.224
255.255.255.128
IEEE 802.3

7. IEEE Standards: Ethernet
Packets
Every 32 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
IEEE 802.3

8. EIGRP: How do you view if there are any successor routes?
Segments
R1(config)#router rip - R1(config-router)#version 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Show ip eigrp topology

9. EIGRP: What is the name of the algorithm used for EIGRP?
IEEE 802.3ab
DUAL: Difusing Update Algorithm
Add the magic number to the network minus 1
255.255.255.224

10. Subnetting: What is a 255.255.255.240 in prefix notation
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.
Bandwidth - Delay - reliability and Load
/28
Shortest path first - (SPF)

11. Rip Timers: How long is the default for Holddown timer.
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Frames
Session
180

12. Subnetting: What is a /30 in Decimal
/28
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.255.252

13. EIGRP: What is the default administrative distance?
100
Every 32 ip's
Router(config)#ip route {network address} {subnet-mask}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

14. Subnetting: What is a 255.255.252.0 in prefix notation
Transport
/22
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Periodic Updates of their routing table

15. What is Layer 2 in the OSI Model?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Switch forwards the frame as soon as it can
Show ip eigrp topology
Data-Link

16. Symbol for EIGRP on a Show ip route
255.255.255.128
D
Transport
Every 64 ip's

17. What is Layer 3 in the OSI Model?
/22
Segments
Network
Every 16 ip's

18. What is the layer 4 PDU called?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Segments
Shortest path first - (SPF)
Physical

19. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
DCE
R3(config)#router rip - R3(config-router)#network 192.168.1.2
62 per network
Closest multiple of the magic number that is not over the interesting octets number.

20. Subnetting: What is a /18 in Decimal
Query and other router responds with a REPLY packet.
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.
255.255.192.0
Show ip eigrp topology

21. Command for a static route with exit interface
Router(config)#ip route {exit-interface}
Segments
Switch forwards the frame as soon as it can
255.255.255.128

22. Rip: What is the command to enable Ripv2?
Periodic Updates of their routing table
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
R1(config)#router rip - R1(config-router)#version 2
Every 16 ip's

23. What is the layer 2 PDU called?
Switch forwards frame once it completely receives it
Network
Frames
Periodic Updates of their routing table

24. What is Layer 7 in the OSI Model?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
180 seconds
Application
180

25. IEEE Standards: Gibabit Ethernet (Fibre)
2 - each port is it's own collision domain
IEEE 802.3z
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

26. Name the OSI Layers
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
255.255.0.0
180

27. What is Layer 1 in the OSI Model?
Hop Count
Shortest path first - (SPF)
Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

28. IEEE Standards: Fast Ethernet
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)#
30 per network
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3u

29. 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

30. Switching Methods: What is Store and Forward?
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (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.
Switch forwards frame once it completely receives it

31. OSPF: how do you change the cost of an interface for OSPF?
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.
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
IEEE 802.3ab
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

32. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
14 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - each port is it's own collision domain

33. EIGRP: What is the range of Autonomous System numbers?
180 seconds
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1-65535
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

34. Rip: how do hold down timers work?
Router(config)#ip route {network address} {subnet-mask}
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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
110

35. Subnetting: What is a /25 in Decimal
255.255.255.128
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
IEEE 802.3u
Network

36. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

37. 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.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 128 ip's

38. 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

39. 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

40. What is the Transport PDU called?
Session
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Segments
Network

41. Using the magic number how to you figure the network?
Periodic Updates of their routing table
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Closest multiple of the magic number that is not over the interesting octets number.
Layer 2

42. What are the commands to setup SSH?
/22
Switch forwards frame once it completely receives it
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)#

43. What is Layer 6 in the OSI Model?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Bandwidth - Delay - reliability and Load
Presentation
Every 64 ip's

44. Command for a static route with 'Next Hop' Address
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Router(config)#ip route {network address} {subnet-mask}
180 seconds
Query and other router responds with a REPLY packet.

45. 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
255.255.192.0
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1-65535

46. Subnetting: What is a 255.128.0.0 in prefix notation
Hop Count
/9
2 - each port is it's own collision domain
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

47. IEEE Standards: Gibabit Ethernet (Copper)
/24
R1(config)#router rip - R1(config-router)#version 2
Segments
IEEE 802.3ab

48. 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
Physical
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Every 32 ip's

49. EIGRP: What is the hello packet used for?
/9
D
Router(config)#ip route {network address} {subnet-mask}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

50. OSPF: What is the default administrative distance?
110
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.
IEEE 802.3u
Closest multiple of the magic number that is not over the interesting octets number.