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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. What is the Network PDU called?
Packets
/22
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Router(config)#ip route {exit-interface}

2. What is Layer 7 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
Application
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Switch forwards the frame as soon as it can

3. CABLES: What is the T568B Pinout Standard?
126 per network
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
Frames

4. Name the TCP/IP Layers
R1(config)#router rip - R1(config-router)#version 2
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Segments
Every 64 ip's

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

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6. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
126 per network
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
255.255.192.0

7. What are the comands to set the clock rate in a serial connection?
255.255.255.252
255.255.192.0
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)#
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

8. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
110
Shortest path first - (SPF)
2 hosts

9. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Every 128 ip's
126 per network
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

10. What are the commands to setup SSH?
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.
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.
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)#
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

11. Rip: What causes a triggered update?
Shortest path first - (SPF)
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Packets
Query and other router responds with a REPLY packet.

12. Symbol for EIGRP on a Show ip route
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
D
/24
100

13. What is the metric for RIP
Switch forwards frame once it completely receives it
Every 16 ip's
Hop Count
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical

14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
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
14 per network
Show ip eigrp topology
2 - each port is it's own collision domain

15. RIP: What is the default Administrative Distance?
120
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
255.255.0.0
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change

16. IEEE Standards: Gibabit Ethernet (Fibre)
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
DCE
Segments
IEEE 802.3z

17. EIGRP: What packet is used to propagate routing information?
60
Closest multiple of the magic number that is not over the interesting octets number.
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

18. RIP: What Algorithm is used in RIP>
Frames
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Bellman-Ford
Router(config)#ip route {exit-interface}

19. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
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
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
100
180 seconds

20. Rip: how do hold down timers work?
/24
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
Pins 1+2 swap places with pins 3+6
Session

21. Subnetting: What is a /25 in Decimal
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)#
255.255.255.128
IEEE 802.3u
Every 4 ip's

22. RIP Timers: What is an invalid Timer?
/9
2 hosts
120
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.

23. EIGRP: What is the range of Autonomous System numbers?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
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
1-65535
255.255.0.0

24. Rip: Command to prevent rip updates on an interface
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
IEEE 802.3ab
Every 64 ip's
Router(config)#ip route {network address} {subnet-mask}

25. Subnetting: What is a 255.255.255.0 in prefix notation
Router(config)#ip route {exit-interface}
Router(config)#ip route {network address} {subnet-mask}
/24
Shortest path first - (SPF)

26. Rip Timers: How long is the default for Flush timer.
IEEE 802.3ab
Layer 2
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
60

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

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28. What is the layer 4 PDU called?
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
Shortest path first - (SPF)
2 - each port is it's own collision domain
Segments

29. EIGRP: What is the default administrative distance?
100
Switch forwards frame once it completely receives it
Segments
/28

30. RIP Timers: What is an Holddown Timer?
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
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
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

31. What is the boot sequence for Cisco Routers?
180
Every 4 ip's
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
255.255.255.224

32. What is Layer 1 in the OSI Model?
Physical
Closest multiple of the magic number that is not over the interesting octets number.
60
DUAL: Difusing Update Algorithm

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

34. OSPF: how do you change the cost of an interface for OSPF?
DCE
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
180
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

35. Using the magic number how to you figure the network?
Closest multiple of the magic number that is not over the interesting octets number.
Every 16 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)#
Shortest path first - (SPF)

36. What Layer does CDP operate at?
IEEE 802.3
Switch forwards the frame as soon as it can
Layer 2
255.255.255.128

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

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

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39. Subnetting: What is a /27 in Decimal
126 per network
/22
Packets
255.255.255.224

40. EIGRP: What packet is used to search for networks?
100
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Session
Query and other router responds with a REPLY packet.

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

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42. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
Router(config)#ip route {exit-interface}
2 - the bridge separates the collision domain
Layer 2
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240

43. Rip: What is the command to enable Ripv2?
Segments
30 per network
R1(config)#router rip - R1(config-router)#version 2
120

44. EIGRP: How do you view if there are any successor routes?
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Show ip eigrp topology
180
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

45. What is Layer 5 in the OSI Model?
Segments
Session
Router(config)#ip route {network address} {subnet-mask}
Show ip eigrp topology

46. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
180 seconds
Presentation
Show ip eigrp topology

47. EIGRP: What is the hello packet used for?
Segments
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
2 hosts

48. Subnetting: What is a /18 in Decimal
2 - each port is it's own collision domain
255.255.255.224
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
255.255.192.0

49. What gets the clock rate - DCE or DTE?
D
DCE
Every 16 ip's
Hop Count

50. Subnetting: What is a /30 in Decimal
/9
D
255.255.255.252
R3(config)#router rip - R3(config-router)#network 192.168.1.2