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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. CABLES: What is the difference between T568A and T568B?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
DUAL: Difusing Update Algorithm
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Pins 1+2 swap places with pins 3+6

2. Subnetting: What is a /25 in Decimal
100
D
255.255.255.128
DUAL: Difusing Update Algorithm

3. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
IEEE 802.3u
1-65535
2 - the bridge separates the collision domain
62 per network

4. What is Layer 7 in the OSI Model?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
DCE
Application
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

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

6. What is the metric for EIGRP
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
IEEE 802.3ab
2 hosts
Bandwidth - Delay - reliability and Load

7. Rip and EIGRP use what to keep other routers aware of their status?
110
Periodic Updates of their routing table
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
100

8. EIGRP: What is the name of the algorithm used for EIGRP?
255.255.192.0
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
DUAL: Difusing Update Algorithm

9. What is the Data-Link PDU called?
DUAL: Difusing Update Algorithm
2 - each port is it's own collision domain
255.255.0.0
Frames

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

11. Rip Timers: How long is the default for Flush timer.
Every 4 ip's
60
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

12. What is Layer 5 in the OSI Model?
Bandwidth - Delay - reliability and Load
IEEE 802.3u
Session
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

13. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Every 16 ip's
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 128 ip's
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

14. What is the boot sequence for Cisco Routers?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Layer 2
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
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

15. Switching Methods: What is Fragment-free?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 16 ip's
Every 32 ip's

16. What is the layer 3 PDU called?
Periodic Updates of their routing table
Packets
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)#
Router(config)#ip route {network address} {subnet-mask}

17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
110
30 per network
Packets
Segments

18. What are the commands to setup SSH?
Hop Count
/9
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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)#

19. EIGRP: What packet is used to search for networks?
Every 32 ip's
Switch forwards frame once it completely receives it
62 per network
Query and other router responds with a REPLY packet.

20. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
Hop Count
180 seconds
2 - the bridge separates the collision domain

21. Rip Timers: How long is the default for Invalid timer.
2 hosts
60
DCE
180 seconds

22. What is Layer 2 in the OSI Model?
1-65535
Every 8 ip's
100
Data-Link

23. EIGRP: What is the hello packet used for?
Query and other router responds with a REPLY packet.
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
180 seconds

24. Subnetting: What is a 255.255.252.0 in prefix notation
Data-Link
/22
110
Physical

25. EIGRP: How do you view if there are any successor routes?
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
Show ip eigrp topology
255.255.255.224
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

26. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
/22
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

27. Rip: how do hold down timers work?
60
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
255.255.255.252
1 - everything hooked to the hub is in the same collision domain

28. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/24
255.255.192.0
Data-Link

29. Name the TCP/IP Layers
Physical
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1-65535
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

30. Subnetting: What is a 255.128.0.0 in prefix notation
IEEE 802.3z
Every 32 ip's
Application
/9

31. Using the magic number how to you figure the network?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
DUAL: Difusing Update Algorithm
Closest multiple of the magic number that is not over the interesting octets number.
R

32. What Layer does CDP operate at?
Layer 2
R1(config)#router rip - R1(config-router)#version 2
14 per network
1-65535

33. Subnetting: What is a /30 in Decimal
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Layer 2
255.255.255.252
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

34. 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
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.
255.255.255.252
2 - each port is it's own collision domain

35. IEEE Standards: Fast Ethernet
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.
Packets
IEEE 802.3u
Periodic Updates of their routing table

36. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 - the bridge separates the collision domain
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
30 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

37. What is the layer 4 PDU called?
Every 64 ip's
Packets
Segments
Add the magic number to the network minus 1

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

39. Subnetting: What is a /16 in Decimal
14 per network
1 - everything hooked to the hub is in the same collision domain
Shortest path first - (SPF)
255.255.0.0

40. What is the Transport PDU called?
Bandwidth - Delay - reliability and Load
255.255.255.224
Segments
Router(config)# router rip - Router(config-router)# passive-interface fa0/0

41. CABLES: What is the T568B Pinout Standard?
Every 32 ip's
Segments
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

42. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Periodic Updates of their routing table
Switch forwards frame once it completely receives it
255.255.255.224
R3(config)#router rip - R3(config-router)#network 192.168.1.2

43. Subnetting: What is a 255.255.255.0 in prefix notation
14 per network
Closest multiple of the magic number that is not over the interesting octets number.
/24
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

44. What is Layer 1 in the OSI Model?
255.255.255.128
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Physical
Show ip eigrp topology

45. IEEE Standards: Ethernet
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Shortest path first - (SPF)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
IEEE 802.3

46. What is Layer 6 in the OSI Model?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
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)#
Presentation
Every 64 ip's

47. Subnetting: What is a 255.255.255.240 in prefix notation
180 seconds
Bandwidth - Delay - reliability and Load
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
/28

48. RIP: What Algorithm is used in RIP>
Switch forwards frame once it completely receives it
R1(config)#router rip - R1(config-router)#version 2
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Bellman-Ford

49. 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
Bellman-Ford
Every 8 ip's
/28

50. Command for a static route with exit interface
100
Router(config)#ip route {exit-interface}
Hop Count
Router(config)# router rip - Router(config-router)# passive-interface fa0/0