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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. Command for a static route with 'Next Hop' Address
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)#ip route {exit-interface}
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Router(config)#ip route {network address} {subnet-mask}

2. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 8 ip's
Every 128 ip's

3. What is Layer 1 in the OSI Model?
180 seconds
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Physical
100

4. Rip Timers: How long is the default for Flush timer.
IEEE 802.3
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
60
Network

5. Subnetting: What is a /30 in Decimal
Hop Count
DUAL: Difusing Update Algorithm
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
255.255.255.252

6. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Every 64 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Hop Count
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)#

7. Switching Methods: What is Cut-through?
14 per network
Switch forwards the frame as soon as it can
Pins 1+2 swap places with pins 3+6
Shortest path first - (SPF)

8. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
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
14 per network
Every 128 ip's

9. 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
255.255.255.128
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {network address} {subnet-mask}

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

11. RIP: What Algorithm is used in RIP>
Every 8 ip's
/24
Bellman-Ford
100

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

13. IEEE Standards: Fast Ethernet
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
IEEE 802.3u
IEEE 802.3ab
Presentation

14. What is the layer 3 PDU called?
Transport
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
2 - each port is it's own collision domain

15. Subnetting: What is a /25 in Decimal
100
Query and other router responds with a REPLY packet.
/28
255.255.255.128

16. RIP Timers: What is an invalid Timer?
IEEE 802.3z
100
30 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.

17. Using the magic number how to you figure the broadcast?
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
D
Add the magic number to the network minus 1

18. What gets the clock rate - DCE or DTE?
Physical
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in 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
DCE

19. What is the layer 2 PDU called?
Packets
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
IEEE 802.3u

20. EIGRP: How do you view if there are any successor routes?
Add the magic number to the network minus 1
Physical
Query and other router responds with a REPLY packet.
Show ip eigrp topology

21. EIGRP: What packet is used to search for networks?
120
Query and other router responds with a REPLY packet.
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)#
1-65535

22. Subnetting: What is a 255.128.0.0 in prefix notation
62 per network
IEEE 802.3z
Every 32 ip's
/9

23. Name the TCP/IP Layers
R3(config)#router rip - R3(config-router)#network 192.168.1.2
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
D
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

24. What are the commands to setup SSH?
/22
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
/9
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)#

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Every 32 ip's
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
126 per network
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

26. Switching Methods: What is Store and Forward?
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
Switch forwards frame once it completely receives it
Frames
60

27. 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
DCE
2 hosts
Segments

28. What is the Data-Link PDU called?
Bellman-Ford
Application
62 per network
Frames

29. Using the magic number how to you figure the network?
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
Closest multiple of the magic number that is not over the interesting octets number.
Every 64 ip's
2 - each port is it's own collision domain

30. OSPF: What is the default administrative distance?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
110
/28
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)#

31. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
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.
DUAL: Difusing Update Algorithm
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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

32. CABLES: What is the T568B Pinout Standard?
180
Application
Every 4 ip's
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

33. Subnetting: What is a 255.255.255.0 in prefix notation
Show ip eigrp topology
/24
120
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.

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

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
120
/28
Switch forwards the frame as soon as it can

36. What Layer does CDP operate at?
Layer 2
Every 16 ip's
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
62 per network

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

38. IEEE Standards: Gibabit Ethernet (Copper)
Network
2 hosts
255.255.255.252
IEEE 802.3ab

39. EIGRP: What is the name of the algorithm used for EIGRP?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
DUAL: Difusing Update Algorithm
Switch forwards frame once it completely receives it
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

40. RIP Timers: What is an Flush Timer?
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.
14 per network
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

41. CABLES: What is the difference between T568A and T568B?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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)#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)#
Pins 1+2 swap places with pins 3+6

42. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
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
DUAL: Difusing Update Algorithm
2 - the bridge separates the collision domain

43. Subnetting: What is a 255.255.252.0 in prefix notation
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.255.128
/22
Application

44. What is Layer 5 in the OSI Model?
Session
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.
Every 8 ip's
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization

45. EIGRP: What is the range of Autonomous System numbers?
2 hosts
1 - everything hooked to the hub is in the same 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)#
1-65535

46. What is Layer 3 in the OSI Model?
D
Network
/24
Closest multiple of the magic number that is not over the interesting octets number.

47. 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
Query and other router responds with a REPLY packet.
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
180 seconds

48. Rip: how do hold down timers work?
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
Switch forwards frame once it completely receives it
62 per network

49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Switch forwards the frame as soon as it can
/28
D
62 per network

50. What is Layer 4 in the OSI Model?
Session
180 seconds
Transport
2 - each port is it's own collision domain