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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: How do you view if there are any successor routes?
Show ip eigrp topology
Bellman-Ford
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Query and other router responds with a REPLY packet.

2. 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
Switch forwards frame once it completely receives it
180
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)#

3. What is the boot sequence for Cisco Routers?
120
60
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
180 seconds

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

5. Subnetting: What is a /25 in Decimal
255.255.255.128
Every 8 ip's
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.
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)

6. EIGRP: What is the range of Autonomous System numbers?
255.255.0.0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1-65535
DUAL: Difusing Update Algorithm

7. What is the layer 2 PDU called?
Shortest path first - (SPF)
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)#ip route {network address} {subnet-mask}
Frames

8. Name the OSI Layers
60
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Data-Link
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

9. Subnetting: What is a 255.255.252.0 in prefix notation
2 - each port is it's own collision domain
/22
Every 32 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

10. What is the Network PDU called?
255.255.255.128
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Packets
R

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

12. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
DUAL: Difusing Update Algorithm
60
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

13. Symbol for Rip on a Show ip route
Segments
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
100
R

14. What is Layer 4 in the OSI Model?
Transport
R1(config)#router rip - R1(config-router)#version 2
1-65535
Show ip eigrp topology

15. What is the metric for EIGRP
Every 8 ip's
Bandwidth - Delay - reliability and Load
D
Packets

16. IEEE Standards: Fast Ethernet
Bellman-Ford
/9
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3u

17. What are the commands to setup SSH?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
120
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)#
Physical

18. What are the comands to set the clock rate in a serial connection?
Every 32 ip's
Show ip eigrp topology
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/24

19. OSPF: What is the default administrative distance?
120
Data-Link
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
110

20. Rip: What is the command to enable Ripv2?
30 per network
Query and other router responds with a REPLY packet.
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
R1(config)#router rip - R1(config-router)#version 2

21. Rip: What causes a triggered update?
2 - the bridge separates the collision domain
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
D
Application

22. Rip Timers: How long is the default for Holddown timer.
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Add the magic number to the network minus 1
/28
180

23. What is Layer 6 in the OSI Model?
Presentation
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Bellman-Ford

24. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Presentation
60
Physical
126 per network

25. 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
255.255.0.0
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Session

26. Subnetting: What is a /30 in Decimal
110
/28
255.255.255.252
120

27. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.255.252
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Layer 2

28. Using the magic number how to you figure the network?
Pins 1+2 swap places with pins 3+6
Application
Closest multiple of the magic number that is not over the interesting octets number.
IEEE 802.3z

29. What is Layer 3 in the OSI Model?
R1(config)#router rip - R1(config-router)#version 2
Network
Bandwidth - Delay - reliability and Load
Physical

30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
1 - everything hooked to the hub is in the same collision domain
Router(config)#ip route {exit-interface}
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)#
2 hosts

31. OSPF: What Algorithm is used?
Switch forwards frame once it completely receives it
Every 8 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Shortest path first - (SPF)

32. Switching Methods: What is Store and Forward?
/9
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards frame once it completely receives it
DUAL: Difusing Update Algorithm

33. Name the TCP/IP Layers
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/28

34. Rip: What does v2 have that v1 does not?
DCE
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
126 per network

35. What is the layer 3 PDU called?
Pins 1+2 swap places with pins 3+6
Packets
Transport
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

36. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Switch forwards the frame as soon as it can
DUAL: Difusing Update Algorithm
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
255.255.255.128

37. IEEE Standards: Ethernet
Periodic Updates of their routing table
IEEE 802.3
100
Session

38. RIP Timers: What is an Holddown Timer?
Bandwidth - Delay - reliability and Load
Segments
Periodic Updates of their 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

39. What is Layer 7 in the OSI Model?
Transport
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
/22
Application

40. Rip: Command to prevent rip updates on an interface
Every 16 ip's
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Add the magic number to the network minus 1
110

41. What Layer does CDP operate at?
Layer 2
Every 8 ip's
Router(config)#ip route {network address} {subnet-mask}
DCE

42. Command for a static route with exit interface
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
126 per network
Router(config)#ip route {exit-interface}

43. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Every 32 ip's
Presentation
Frames

44. What is Layer 2 in the OSI Model?
14 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Data-Link
Packets

45. Switching Methods: What is Fragment-free?
Transport
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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)#
Layer 2

46. What gets the clock rate - DCE or DTE?
Every 32 ip's
Network
DCE
Packets

47. Rip Timers: How long is the default for Invalid timer.
Application
Frames
180 seconds
Layer 2

48. What is the Transport PDU called?
Segments
/22
255.255.192.0
Every 128 ip's

49. Subnetting: What is a 255.128.0.0 in prefix notation
DCE
180 seconds
/9
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical

50. 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
1-65535
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
R3(config)#router rip - R3(config-router)#network 192.168.1.2