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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. Rip and EIGRP use what to keep other routers aware of their status?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
IEEE 802.3z
Periodic Updates of their routing table
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Session
14 per network
IEEE 802.3
Pins 1+2 swap places with pins 3+6

3. Rip Timers: How long is the default for Holddown timer.
Frames
1 - everything hooked to the hub is in the same collision domain
Add the magic number to the network minus 1
180

4. Rip: What causes a triggered update?
Switch forwards frame once it completely receives it
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
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Data-Link

5. Name the TCP/IP Layers
Router(config)#ip route {network address} {subnet-mask}
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

6. Rip: Command to prevent rip updates on an interface
120
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3z
Physical

7. EIGRP: What packet is used to propagate routing information?
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
255.255.0.0
1-65535

8. OSPF: how do you change the cost of an interface for OSPF?
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
60
Periodic Updates of their routing table
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

9. EIGRP: What is the default administrative distance?
100
DUAL: Difusing Update Algorithm
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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.

10. Subnetting: What is a 255.255.255.0 in prefix notation
/24
DCE
Periodic Updates of their routing table
180

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

12. CABLES: What is the difference between T568A and T568B?
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Segments
DUAL: Difusing Update Algorithm
Pins 1+2 swap places with pins 3+6

13. What gets the clock rate - DCE or DTE?
DCE
IEEE 802.3
255.255.0.0
Presentation

14. What is Layer 1 in the OSI Model?
DCE
DUAL: Difusing Update Algorithm
Physical
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

15. 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
Frames
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Shortest path first - (SPF)

16. What is the boot sequence for Cisco Routers?
Pins 1+2 swap places with pins 3+6
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1-65535

17. What is the Transport PDU called?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Segments
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.252

18. What is the Data-Link PDU called?
Frames
30 per network
60
R

19. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
1 - everything hooked to the hub is in the same 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
Add the magic number to the network minus 1

20. Symbol for Rip on a Show ip route
R
Switch forwards the frame as soon as it can
IEEE 802.3
255.255.255.252

21. What is Layer 6 in the OSI Model?
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Presentation
Frames
/9

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

23. What is Layer 7 in the OSI Model?
IEEE 802.3u
Every 128 ip's
Application
Physical

24. What are the comands to set the clock rate in a serial connection?
Packets
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.
14 per network
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

25. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Data-Link
255.255.0.0
120

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

27. 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)#
255.255.192.0
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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. Subnetting: What is a 255.255.255.240 in prefix notation
255.255.255.252
2 hosts
/28
Frames

29. OSPF: What does OSPF use for its metric?
Presentation
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}

30. Subnetting: What is a /16 in Decimal
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
255.255.0.0
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
120

31. What is the layer 2 PDU called?
180
R
255.255.255.252
Frames

32. Rip: how do hold down timers work?
180
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
IEEE 802.3z

33. Rip: What is the command to enable Ripv2?
Router(config)#ip route {network address} {subnet-mask}
/9
R1(config)#router rip - R1(config-router)#version 2
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

34. Symbol for EIGRP on a Show ip route
255.255.0.0
D
Segments
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
255.255.0.0
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
62 per network

36. IEEE Standards: Fast Ethernet
1-65535
IEEE 802.3u
Packets
R

37. Using the magic number how to you figure the network?
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.
255.255.0.0
Closest multiple of the magic number that is not over the interesting octets number.
DCE

38. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
/24
Add the magic number to the network minus 1
Session
2 hosts

39. Command for a static route with exit interface
Add the magic number to the network minus 1
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)#
180

40. EIGRP: What packet is used to search for networks?
255.255.255.224
Query and other router responds with a REPLY packet.
30 per network
/9

41. What is the layer 3 PDU called?
Packets
2 - the bridge separates the collision domain
Every 16 ip's
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

42. How do you find the magic number for subnetting?
180
Router(config)#ip route {network address} {subnet-mask}
255.255.255.128
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

43. Subnetting: What is a 255.255.252.0 in prefix notation
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Packets
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
/22

44. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
Every 64 ip's
Presentation
Segments

45. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
IEEE 802.3z
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 OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

46. EIGRP: What is the range of Autonomous System numbers?
IEEE 802.3u
120
1-65535
/9

47. 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.
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)#
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Data-Link

48. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
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.
14 per network
2 - each port is it's own collision domain
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3

49. RIP Timers: What is an invalid Timer?
IEEE 802.3u
2 - each port is it's own collision domain
Switch forwards the frame as soon as it can
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.

50. What is the layer 4 PDU called?
IEEE 802.3ab
62 per network
Segments
D