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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. Using the magic number how to you figure the broadcast?
Add the magic number to the network minus 1
Session
Bellman-Ford
2 - the bridge separates the collision domain

2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
30 per network
Hop Count
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
D

3. What are the comands to set the clock rate in a serial connection?
60
Presentation
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3

4. RIP: What is the default Administrative Distance?
120
Application
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

5. What is the Transport PDU called?
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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
Segments
Packets

6. EIGRP: What packet is used to search for networks?
Presentation
Every 8 ip's
Switch forwards the frame as soon as it can
Query and other router responds with a REPLY packet.

7. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
R1(config)#router rip - R1(config-router)#version 2
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
180 seconds
14 per network

8. CABLES: What is the difference between T568A and T568B?
255.255.0.0
Pins 1+2 swap places with pins 3+6
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
2 hosts

9. What are the commands to setup SSH?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Every 64 ip's
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)#
Hop Count

10. RIP Timers: What is an Flush Timer?
1 - everything hooked to the hub is in the same collision domain
/22
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:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown

11. OSPF: What is the process used by OSPF to build a routing table (step by step)
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. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Presentation

12. OSPF: how do you change the cost of an interface for OSPF?
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.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
255.255.255.224
2 - each port is it's own collision domain

13. Symbol for EIGRP on a Show ip route
Network
Switch forwards frame once it completely receives it
D
126 per network

14. Name the TCP/IP Layers
120
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
D

15. What is the metric for RIP
IEEE 802.3z
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Hop Count

16. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Bellman-Ford
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
D
Data-Link

17. What is Layer 4 in the OSI Model?
1-65535
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
Transport

18. What is Layer 6 in the OSI Model?
Every 8 ip's
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Presentation
Switch forwards the frame as soon as it can

19. EIGRP: What is the hello packet used for?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Packets
30 per network
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds

20. RIP: What Algorithm is used in RIP>
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Bellman-Ford
Segments
Transport

21. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
1 - everything hooked to the hub is in the same collision domain
180
Every 4 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2

22. Rip Timers: How long is the default for Holddown timer.
/22
255.255.192.0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
180

23. What is Layer 7 in the OSI Model?
120
30 per network
Application
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.

24. RIP Timers: What is an Holddown Timer?
Application
Frames
/22
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

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

26. EIGRP: What is the name of the algorithm used for EIGRP?
Bandwidth - Delay - reliability and Load
255.255.0.0
Layer 2
DUAL: Difusing Update Algorithm

27. Switching Methods: What is Cut-through?
Switch forwards the frame as soon as it can
/24
R
Pins 1+2 swap places with pins 3+6

28. Command for a static route with 'Next Hop' Address
Physical
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Router(config)#ip route {network address} {subnet-mask}
126 per network

29. Rip: What causes a triggered update?
Every 16 ip's
/22
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Periodic Updates of their routing table

30. EIGRP: What is the range of Autonomous System numbers?
1-65535
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Shortest path first - (SPF)
255.255.255.252

31. EIGRP: What packet is used to propagate routing information?
Closest multiple of the magic number that is not over the interesting octets number.
Every 16 ip's
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet

32. Rip Timers: How long is the default for Invalid timer.
Packets
Show ip eigrp topology
R
180 seconds

33. Using the magic number how to you figure the network?
Segments
Closest multiple of the magic number that is not over the interesting octets number.
DCE
Shortest path first - (SPF)

34. CABLES: What is the T568A Pinout Standard?
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Packets
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database

35. What is the layer 4 PDU called?
R1(config)#router rip - R1(config-router)#version 2
IEEE 802.3ab
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Segments

36. IEEE Standards: Gibabit Ethernet (Copper)
Show ip eigrp topology
IEEE 802.3ab
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Frames

37. OSPF: What is the default administrative distance?
Pins 1+2 swap places with pins 3+6
255.255.192.0
/22
110

38. What gets the clock rate - DCE or DTE?
DCE
R3(config)#router rip - R3(config-router)#network 192.168.1.2
255.255.255.252
Bellman-Ford

39. 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
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)#
/22
Packets

40. Subnetting: What is a /27 in Decimal
Switch forwards the frame as soon as it can
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.224
255.255.255.128

41. EIGRP: What is the default administrative distance?
100
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Add the magic number to the network minus 1
/28

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

43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.252
Hop Count
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
2 hosts

44. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
255.255.192.0
2 - the bridge separates the collision domain
Every 64 ip's
Every 16 ip's

45. What is Layer 5 in the OSI Model?
Packets
Session
255.255.255.128
Layer 2

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

47. What is Layer 2 in the OSI Model?
Transport
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
Data-Link

48. Subnetting: What is a 255.255.255.240 in prefix notation
R1(config)#router rip - R1(config-router)#version 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
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.
/28

49. What Layer does CDP operate at?
Layer 2
1 - everything hooked to the hub is in the same collision domain
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
255.255.0.0

50. Name the OSI Layers
Every 8 ip's
/24
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical