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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. EIGRP: What is the name of the algorithm used for EIGRP?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
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)#
Frames

2. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 8 ip's
DUAL: Difusing Update Algorithm
Physical

3. What is the boot sequence for Cisco Routers?
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)#
110
/24
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

4. Rip Timers: How long is the default for Invalid timer.
Every 4 ip's
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
180 seconds

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

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6. RIP Timers: What is an invalid Timer?
Session
/28
Frames
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.

7. CABLES: What is the T568B Pinout Standard?
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Every 64 ip's
30 per network
Physical

8. OSPF: What does OSPF use for its metric?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
R
Bellman-Ford
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

9. 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
100
Bellman-Ford
DCE

10. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Router(config)#ip route {network address} {subnet-mask}
1-65535
IEEE 802.3

11. Using the magic number how to you figure the network?
Packets
R
Closest multiple of the magic number that is not over the interesting octets number.
Frames

12. OSPF: What is the process used by OSPF to build a routing table (step by step)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Segments
126 per network
Every 32 ip's

13. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
255.255.0.0
126 per network
D
Add the magic number to the network minus 1

14. Subnetting: What is a /25 in Decimal
255.255.255.128
30 per network
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
100

15. OSPF: how do you change the cost of an interface for OSPF?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Segments
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
/22

16. Rip: What is the command to enable Ripv2?
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
14 per network
R1(config)#router rip - R1(config-router)#version 2
R3(config)#router rip - R3(config-router)#network 192.168.1.2

17. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Segments
Packets
2 hosts
IEEE 802.3u

18. RIP Timers: What is an Flush Timer?
/24
R3(config)#router rip - R3(config-router)#network 192.168.1.2
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
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.

19. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
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.
Physical
Switch forwards the frame as soon as it can

20. OSPF: What Algorithm is used?
1 - everything hooked to the hub is in the same collision domain
2 - each port is it's own collision domain
/28
Shortest path first - (SPF)

21. What is the metric for RIP
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Hop Count
DUAL: Difusing Update Algorithm

22. RIP: What is the default Administrative Distance?
180 seconds
Network
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.

23. 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
Data-Link
30 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

24. What is Layer 1 in the OSI Model?
/9
Physical
Switch forwards the frame as soon as it can
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

25. What are the comands to set the clock rate in a serial connection?
R
Pins 1+2 swap places with pins 3+6
Data-Link
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

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

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27. What Layer does CDP operate at?
DUAL: Difusing Update Algorithm
Layer 2
2 - the bridge separates the collision domain
120

28. CABLES: What is the difference between T568A and T568B?
Pins 1+2 swap places with pins 3+6
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
Every 16 ip's

29. Subnetting: What is a 255.255.255.0 in prefix notation
/24
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
2 hosts
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

30. EIGRP: How do you view if there are any successor routes?
Frames
Show ip eigrp topology
/9
Closest multiple of the magic number that is not over the interesting octets number.

31. Subnetting: What is a /16 in Decimal
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
255.255.0.0
100
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

32. IEEE Standards: Fast Ethernet
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
100
IEEE 802.3u
60

33. Subnetting: What is a /18 in Decimal
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
2 - the bridge separates the collision domain
255.255.192.0
Packets

34. Rip Timers: How long is the default for Flush timer.
60
Network
126 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
255.255.255.128
255.255.255.224
60

36. Subnetting: What is a 255.255.255.240 in prefix notation
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
Bandwidth - Delay - reliability and Load
R1(config)#router rip - R1(config-router)#version 2
/28

37. What is the Network PDU called?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/22
Packets
Session

38. What gets the clock rate - DCE or DTE?
/9
DCE
60
R3(config)#router rip - R3(config-router)#network 192.168.1.2

39. What is the Transport PDU called?
Segments
Show ip eigrp topology
/28
255.255.255.224

40. How do you find the magic number for subnetting?
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 128 ip's
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

41. Rip: What causes a triggered update?
Shortest path first - (SPF)
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Every 32 ip's

42. Symbol for EIGRP on a Show ip route
255.255.0.0
D
Bellman-Ford
Pins 1+2 swap places with pins 3+6

43. Command for a static route with exit interface
Every 32 ip's
Router(config)#ip route {exit-interface}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Every 4 ip's

44. What is Layer 3 in the OSI Model?
Network
Show ip eigrp topology
Every 8 ip's
60

45. Subnetting: What is a 255.128.0.0 in prefix notation
Closest multiple of the magic number that is not over the interesting octets number.
/9
IEEE 802.3u
Transport

46. What are the commands to setup SSH?
Segments
Pins 1+2 swap places with pins 3+6
/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)#

47. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Show ip eigrp topology
2 - the bridge separates the collision domain
/24
IEEE 802.3u

48. EIGRP: What packet is used to propagate routing information?
Bellman-Ford
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R

49. What is the layer 3 PDU called?
/28
2 hosts
IEEE 802.3
Packets

50. What is Layer 4 in the OSI Model?
Periodic Updates of their routing table
Transport
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database