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: What is a 255.255.255.0 in prefix notation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
D
/24
Frames


2. What is the boot sequence for Cisco Routers?
Every 32 ip's
Data-Link
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Switch forwards the frame as soon as it can


3. 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


4. What is the Network PDU called?
Packets
IEEE 802.3
Every 16 ip's
Closest multiple of the magic number that is not over the interesting octets number.


5. Subnetting: What is a /16 in Decimal
255.255.0.0
DUAL: Difusing Update Algorithm
62 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)


6. Rip Timers: How long is the default for Invalid timer.
180 seconds
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Data-Link
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical


7. Switching Methods: What is Fragment-free?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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
Frames


8. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Add the magic number to the network minus 1
62 per network
255.255.255.252
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE


9. What is Layer 3 in the OSI Model?
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
Bandwidth - Delay - reliability and Load
Network


10. OSPF: What is the process used by OSPF to build a routing table (step by step)
255.255.255.252
1 - everything hooked to the hub is in the same collision domain
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Show ip eigrp topology


11. What is Layer 7 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
Application
255.255.255.252
2 - each port is it's own collision domain


12. Rip: Command to prevent rip updates on an interface
Transport
62 per network
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3


13. Command for a static route with 'Next Hop' Address
Every 16 ip's
Router(config)#ip route {network address} {subnet-mask}
Segments
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds


14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
126 per network
Packets
R3(config)#router rip - R3(config-router)#network 192.168.1.2


15. What is the Data-Link PDU called?
Switch forwards frame once it completely receives it
255.255.0.0
Closest multiple of the magic number that is not over the interesting octets number.
Frames


16. 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


17. IEEE Standards: Ethernet
R
IEEE 802.3
120
Router(config)#ip route {network address} {subnet-mask}


18. 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


19. What is Layer 6 in the OSI Model?
Application
Presentation
/28
2 - each port is it's own collision domain


20. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
14 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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)#


21. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Application
14 per network
Shortest path first - (SPF)


22. Symbol for EIGRP on a Show ip route
Pins 1+2 swap places with pins 3+6
D
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Frames


23. 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
IEEE 802.3ab
IEEE 802.3u
Closest multiple of the magic number that is not over the interesting octets number.


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
Switch forwards the frame as soon as it can
Frames
Add the magic number to the network minus 1


25. Rip: how do hold down timers work?
/24
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
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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


26. EIGRP: How do you view if there are any successor routes?
2 - each port is it's own collision domain
Router(config)#ip route {network address} {subnet-mask}
Show ip eigrp topology
Data-Link


27. 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


28. What is the layer 2 PDU called?
1-65535
255.255.192.0
14 per network
Frames


29. IEEE Standards: Gibabit Ethernet (Fibre)
100
Frames
1 - everything hooked to the hub is in the same collision domain
IEEE 802.3z


30. RIP Timers: What is an Flush Timer?
Add the magic number to the network minus 1
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.
Packets
180


31. What is Layer 5 in the OSI Model?
Presentation
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Session
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown


32. What gets the clock rate - DCE or DTE?
DCE
Packets
Add the magic number to the network minus 1
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)


33. EIGRP: What is the hello packet used for?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Presentation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Pins 1+2 swap places with pins 3+6


34. Rip Timers: How long is the default for Flush timer.
60
Bandwidth - Delay - reliability and Load
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization


35. Switching Methods: What is Cut-through?
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 the frame as soon as it can
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Session


36. RIP: What is the default Administrative Distance?
120
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Segments
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. CABLES: What is the difference between T568A and T568B?
180
Pins 1+2 swap places with pins 3+6
Periodic Updates of their routing table
/28


38. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.255.128
30 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
126 per network


39. What is the layer 3 PDU called?
Frames
Every 8 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Packets


40. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
D
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Router(config)#ip route {network address} {subnet-mask}


41. 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)#
Query and other router responds with a REPLY packet.
255.255.255.128
Bandwidth - Delay - reliability and Load


42. CABLES: What is the T568A Pinout Standard?
120
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
60
Data-Link


43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Periodic Updates of their routing table
2 hosts
14 per network
Switch forwards frame after receiving the 1st 64bytes to insure no errors.


44. 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


45. RIP Timers: What is an invalid Timer?
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
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.
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.
Segments


46. What is the layer 4 PDU called?
Segments
60
Every 8 ip's
Show ip eigrp topology


47. Subnetting: What is a 255.255.252.0 in prefix notation
/22
Bellman-Ford
Every 8 ip's
2 - each port is it's own collision domain


48. EIGRP: What packet is used to search for networks?
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
Query and other router responds with a REPLY packet.
Router(config)#ip route {exit-interface}
Frames


49. CABLES: What is the T568B Pinout Standard?
Data-Link
Switch forwards the frame as soon as it can
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
/24


50. What is the metric for EIGRP
/24
Bandwidth - Delay - reliability and Load
Frames
Session