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. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Add the magic number to the network minus 1
Show ip eigrp topology
Every 128 ip's

2. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Hop Count

3. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
2 - the bridge separates the collision domain
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)#
Query and other router responds with a REPLY packet.

4. EIGRP: What packet is used to propagate routing information?
255.255.255.224
IEEE 802.3ab
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

5. OSPF: What does OSPF use for its metric?
R1(config)#router rip - R1(config-router)#version 2
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
180
126 per network

6. IEEE Standards: Gibabit Ethernet (Fibre)
Segments
IEEE 802.3
Every 8 ip's
IEEE 802.3z

7. EIGRP: What is the default administrative distance?
100
Hop Count
Data-Link
/28

8. What is Layer 4 in the OSI Model?
Session
Transport
Pins 1+2 swap places with pins 3+6
Every 4 ip's

9. What is the layer 2 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
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames

10. Rip: Command to prevent rip updates on an interface
IEEE 802.3z
2 - each port is it's own collision domain
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

11. Subnetting: What is a 255.255.255.0 in prefix notation
Add the magic number to the network minus 1
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
100
/24

12. What Layer does CDP operate at?
Layer 2
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Every 32 ip's

13. OSPF: What Algorithm is used?
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.
IEEE 802.3z
Shortest path first - (SPF)
Every 32 ip's

14. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Add the magic number to the network minus 1
IEEE 802.3z
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

15. Rip: What does v2 have that v1 does not?
/22
120
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Query and other router responds with a REPLY packet.

16. 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

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

18. Rip and EIGRP use what to keep other routers aware of their status?
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Periodic Updates of their routing table
1 - everything hooked to the hub is in the same collision domain

19. How do you find the magic number for subnetting?
Packets
Shortest path first - (SPF)
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
180 seconds

20. What is the layer 4 PDU called?
Presentation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Segments
IEEE 802.3

21. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
180 seconds
30 per network
Show ip eigrp topology
Every 8 ip's

22. EIGRP: What is the hello packet used for?
Closest multiple of the magic number that is not over the interesting octets number.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 4 ip's
Router(config)#ip route {network address} {subnet-mask}

23. What is Layer 6 in the OSI Model?
2 hosts
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Presentation
Network

24. How many Collision domains are there on a with 1 hub and 2 computers?
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
Switch forwards frame once it completely receives it
Application

25. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Add the magic number to the network minus 1
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.

26. RIP Timers: What is an Holddown Timer?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Bandwidth - Delay - reliability and Load
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
Session

27. Symbol for EIGRP on a Show ip route
62 per network
/22
D
Closest multiple of the magic number that is not over the interesting octets number.

28. Subnetting: What is a /27 in Decimal
60
255.255.255.224
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Add the magic number to the network minus 1

29. What are the commands to setup SSH?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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)#
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

30. CABLES: What is the T568A Pinout Standard?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3z
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

31. Command for a static route with exit interface
Query and other router responds with a REPLY packet.
Router(config)#ip route {exit-interface}
IEEE 802.3
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

32. RIP: What Algorithm is used in RIP>
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Bellman-Ford
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Router(config)#ip route {network address} {subnet-mask}

33. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
2 hosts
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
110

34. What is the metric for RIP
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1 - everything hooked to the hub is in the same collision domain
Hop Count
Periodic Updates of their routing table

35. EIGRP: What is the range of Autonomous System numbers?
120
Periodic Updates of their routing table
1-65535
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

36. RIP Timers: What is an Flush Timer?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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.
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)#

37. RIP: What is the default Administrative Distance?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
120
60
Hop Count

38. IEEE Standards: Ethernet
Every 8 ip's
Switch forwards frame once it completely receives it
IEEE 802.3
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

39. 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

40. What is the Data-Link PDU called?
14 per network
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Frames
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

41. Subnetting: What is a 255.255.255.240 in prefix notation
/28
126 per network
R1(config)#router rip - R1(config-router)#version 2
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.

42. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Application
180
Shortest path first - (SPF)

43. Symbol for Rip on a Show ip route
R
IEEE 802.3
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
Periodic Updates of their routing table

44. Using the magic number how to you figure the broadcast?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 - the bridge separates the collision domain
Add the magic number to the network minus 1

45. 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

46. What gets the clock rate - DCE or DTE?
IEEE 802.3ab
Transport
DCE
255.255.0.0

47. Subnetting: What is a /16 in Decimal
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
60
255.255.0.0
Network

48. Subnetting: What is a /30 in Decimal
Every 4 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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.
255.255.255.252

49. 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

50. What is Layer 5 in the OSI Model?
Session
Query and other router responds with a REPLY packet.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Packets