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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. OSPF: What does OSPF use for its metric?
100
IEEE 802.3ab
255.255.0.0
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Closest multiple of the magic number that is not over the interesting octets number.
110
IEEE 802.3u

3. Subnetting: What is a 255.255.255.240 in prefix notation
Show ip eigrp topology
/28
Every 32 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

4. RIP: What is the default Administrative Distance?
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
Presentation
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

5. Subnetting: What is a 255.128.0.0 in prefix notation
Transport
/9
180 seconds
Hop Count

6. Command for a static route with 'Next Hop' Address
Pins 1+2 swap places with pins 3+6
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Router(config)#ip route {network address} {subnet-mask}
/28

7. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Pins 1+2 swap places with pins 3+6
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)#
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

8. IEEE Standards: Gibabit Ethernet (Fibre)
DCE
/22
IEEE 802.3z
Add the magic number to the network minus 1

9. What is Layer 4 in the OSI Model?
1-65535
Bellman-Ford
100
Transport

10. EIGRP: What packet is used to search for networks?
180 seconds
14 per network
Query and other router responds with a REPLY packet.
R3(config)#router rip - R3(config-router)#network 192.168.1.2

11. Rip and EIGRP use what to keep other routers aware of their status?
Session
Every 32 ip's
Physical
Periodic Updates of their routing table

12. What is the layer 2 PDU called?
Frames
1-65535
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
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

13. Using the magic number how to you figure the network?
IEEE 802.3z
2 - the bridge separates the collision domain
Closest multiple of the magic number that is not over the interesting octets number.
Shortest path first - (SPF)

14. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Segments
255.255.255.252
Frames
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

15. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 128 ip's
Layer 2
/22

16. Rip: What is the command to enable Ripv2?
Packets
R
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
R1(config)#router rip - R1(config-router)#version 2

17. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
255.255.255.252
/28
Show ip eigrp topology

18. Symbol for EIGRP on a Show ip route
Bandwidth - Delay - reliability and Load
D
255.255.255.224
100

19. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Shortest path first - (SPF)
Data-Link
IEEE 802.3
2 - the bridge separates the collision domain

20. Subnetting: What is a /16 in Decimal
180
IEEE 802.3ab
255.255.0.0
Segments

21. EIGRP: What is the range of Autonomous System numbers?
1-65535
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK 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)#
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

22. Command for a static route with exit interface
255.255.255.224
Add the magic number to the network minus 1
Router(config)#ip route {exit-interface}
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

23. What is Layer 7 in the OSI Model?
2 - the bridge separates the collision domain
/22
Application
Packets

24. What is the metric for EIGRP
Bandwidth - Delay - reliability and Load
Network
Segments
255.255.0.0

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

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26. Subnetting: What is a /30 in Decimal
IEEE 802.3u
/28
2 - each port is it's own collision domain
255.255.255.252

27. What is the layer 3 PDU called?
Bandwidth - Delay - reliability and Load
Packets
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
IEEE 802.3

28. RIP Timers: What is an Flush Timer?
DCE
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.
Every 32 ip's
Every 4 ip's

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

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30. What is the Transport PDU called?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Segments
IEEE 802.3z
255.255.255.224

31. EIGRP: What packet is used to propagate routing information?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Switch forwards the frame as soon as it can
R3(config)#router rip - R3(config-router)#network 192.168.1.2

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

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33. 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)#
60
Transport
/24

34. Symbol for Rip on a Show ip route
Every 4 ip's
R
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

35. Rip Timers: How long is the default for Holddown timer.
180
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Add the magic number to the network minus 1
Router(config)#ip route {network address} {subnet-mask}

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

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37. Subnetting: What is a 255.255.255.0 in prefix notation
/24
Add the magic number to the network minus 1
IEEE 802.3u
Bandwidth - Delay - reliability and Load

38. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
R1(config)#router rip - R1(config-router)#version 2
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Layer 2

39. What is Layer 3 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Network
2 hosts
Add the magic number to the network minus 1

40. What is Layer 2 in the OSI Model?
110
Data-Link
/24
2 hosts

41. What is the Data-Link PDU called?
Data-Link
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
Frames
Switch forwards the frame as soon as it can

42. What Layer does CDP operate at?
Packets
Layer 2
180
Frames

43. Subnetting: What is a /25 in Decimal
255.255.255.128
Transport
Router(config)#ip route {network address} {subnet-mask}
30 per network

44. Subnetting: What is a /27 in Decimal
255.255.255.224
Every 128 ip's
2 - each port is it's own collision domain
Periodic Updates of their routing table

45. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Packets
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
2 hosts
Presentation

46. Subnetting: where do the networks break with a /30

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47. OSPF: What Algorithm is used?
2 - the bridge separates the collision domain
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.
Shortest path first - (SPF)

48. EIGRP: What is the name of the algorithm used for EIGRP?
DCE
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
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)#

49. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Shortest path first - (SPF)

50. RIP Timers: What is an invalid Timer?
Switch forwards the frame as soon as it can
Every 8 ip's
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 64 ip's