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CCENT

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Show ip eigrp topology
14 per network
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
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.

2. Switching Methods: What is Fragment-free?
/28
Data-Link
2 hosts
Switch forwards frame after receiving the 1st 64bytes to insure no errors.

3. EIGRP: What is the name of the algorithm used for EIGRP?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
60
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
DUAL: Difusing Update Algorithm

4. Subnetting: What is a /16 in Decimal
255.255.0.0
IEEE 802.3z
Frames
Add the magic number to the network minus 1

5. OSPF: What does OSPF use for its metric?
Application
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Packets

6. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Show ip eigrp topology
Hop Count
30 per network
60

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

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8. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Every 32 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.
DCE
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

9. RIP Timers: What is an invalid Timer?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Every 128 ip's
2 hosts
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: where do the networks break with a /26

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11. Command for a static route with 'Next Hop' Address
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
2 - each port is it's own collision domain
Router(config)#ip route {network address} {subnet-mask}
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.

12. How many Collision domains are there on a with 1 hub and 2 computers?
Periodic Updates of their routing table
1 - everything hooked to the hub is in the same collision domain
Every 64 ip's
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE

13. Name the OSI Layers
/24
Network
(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

14. What is the layer 3 PDU called?
Packets
2 hosts
DCE
Session

15. OSPF: What is the default administrative distance?
Every 4 ip's
110
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.
Every 128 ip's

16. What is the metric for EIGRP
2 - each port is it's own collision domain
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.
Bandwidth - Delay - reliability and Load

17. OSPF: how do you change the cost of an interface for OSPF?
1-65535
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Show ip eigrp topology
Segments

18. EIGRP: What is the default administrative distance?
Bandwidth - Delay - reliability and Load
100
Transport
Shortest path first - (SPF)

19. Subnetting: What is a 255.255.255.0 in prefix notation
DUAL: Difusing Update Algorithm
Every 8 ip's
/24
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

20. EIGRP: What is the hello packet used for?
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
255.255.255.128
100
Bellman-Ford

21. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
2 - each port is it's own collision domain
100
R3(config)#router rip - R3(config-router)#network 192.168.1.2
/9

22. EIGRP: How do you view if there are any successor routes?
Segments
Periodic Updates of their routing table
Show ip eigrp topology
Router(config)#ip route {network address} {subnet-mask}

23. What is Layer 3 in the OSI Model?
Segments
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Every 64 ip's
Network

24. Using the magic number how to you figure the broadcast?
255.255.0.0
Add the magic number to the network minus 1
126 per network
1 - everything hooked to the hub is in the same collision domain

25. Subnetting: What is a /25 in Decimal
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
Bellman-Ford
255.255.255.128
Frames

26. What are the comands to set the clock rate in a serial connection?
R
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {exit-interface}
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown

27. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Bellman-Ford
Query and other router responds with a REPLY packet.
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
126 per network

28. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
IEEE 802.3
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
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)#

29. What is the boot sequence for Cisco Routers?
126 per network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
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

30. What is the metric for RIP
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Periodic Updates of their routing table
Hop Count

31. Switching Methods: What is Store and Forward?
Switch forwards frame once it completely receives it
2 - the bridge separates the collision domain
Packets
Shortest path first - (SPF)

32. Using the magic number how to you figure the network?
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Switch forwards the frame as soon as it can
Closest multiple of the magic number that is not over the interesting octets number.
255.255.0.0

33. Symbol for Rip on a Show ip route
110
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Bandwidth - Delay - reliability and Load
R

34. Rip: What causes a triggered update?
2 - the bridge separates the collision domain
180 seconds
Query and other router responds with a REPLY packet.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.

35. IEEE Standards: Fast Ethernet
D
Packets
IEEE 802.3u
180 seconds

36. What is Layer 4 in the OSI Model?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
2 hosts
Transport

37. What Layer does CDP operate at?
62 per network
DCE
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Layer 2

38. Subnetting: What is a /30 in Decimal
Every 16 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252

39. What is the Network PDU called?
Every 64 ip's
Packets
Layer 2
Show ip eigrp topology

40. What is Layer 5 in the OSI Model?
Frames
Session
100
Every 64 ip's

41. What is the Data-Link PDU called?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Application
Frames
R1(config)#router rip - R1(config-router)#version 2

42. How do you find the magic number for subnetting?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
62 per network
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
Every 4 ip's

43. What is the layer 2 PDU called?
Closest multiple of the magic number that is not over the interesting octets number.
Frames
IEEE 802.3ab
Application

44. Subnetting: What is a 255.255.252.0 in prefix notation
Pins 1+2 swap places with pins 3+6
DUAL: Difusing Update Algorithm
/9
/22

45. Rip Timers: How long is the default for Invalid timer.
IEEE 802.3u
60
Network
180 seconds

46. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Router(config)#ip route {network address} {subnet-mask}
2 hosts
Switch forwards frame once it completely receives it
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0

47. EIGRP: What is the range of Autonomous System numbers?
Add the magic number to the network minus 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
126 per network
1-65535

48. Rip Timers: How long is the default for Flush timer.
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
60
Presentation
Hop Count

49. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
62 per network
Router(config)#ip route {network address} {subnet-mask}
180
Network

50. What is Layer 2 in the OSI Model?
60
Data-Link
Layer 2
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1

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