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Test your basic knowledge |
CCENT
Start Test
Study First
Subjects
:
cisco
,
it-skills
,
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: What is the name of the algorithm used for EIGRP?
110
/28
Physical
DUAL: Difusing Update Algorithm
2. Command for a static route with exit interface
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 128 ip's
Router(config)#ip route {exit-interface}
/9
3. RIP Timers: What is an Holddown Timer?
Add the magic number to the network minus 1
60
Segments
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
4. What is Layer 3 in the OSI Model?
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.
Packets
Frames
Network
5. Rip Timers: How long is the default for Holddown timer.
180
Packets
255.255.255.128
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
6. 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)#
R1(config)#router rip - R1(config-router)#version 2
Packets
Presentation
7. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
1-65535
Bellman-Ford
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
8. How many Collision domains are there on a with 1 switch 2 computers?
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9. IEEE Standards: Gibabit Ethernet (Fibre)
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
180 seconds
IEEE 802.3z
10. EIGRP: What is the default administrative distance?
100
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Physical
11. Rip: Command to prevent rip updates on an interface
14 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
Every 4 ip's
12. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Bellman-Ford
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
13. Rip and EIGRP use what to keep other routers aware of their status?
255.255.255.128
126 per network
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
Periodic Updates of their routing table
14. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
R
30 per network
Every 8 ip's
15. What is Layer 1 in the OSI Model?
Transport
180
Physical
Every 128 ip's
16. What is the Data-Link PDU called?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Every 16 ip's
Data-Link
Frames
17. How do you find the magic number for subnetting?
100
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
/9
Frames
18. IEEE Standards: Ethernet
Segments
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
180
IEEE 802.3
19. Rip: how do hold down timers work?
Bandwidth - Delay - reliability and Load
Every 32 ip's
Transport
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
20. Name the TCP/IP Layers
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
62 per network
/24
21. EIGRP: What is the hello packet used for?
/24
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Physical
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
22. Subnetting: What is a /18 in Decimal
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
R
180
23. Subnetting: What is a /16 in Decimal
Switch forwards the frame as soon as it can
Frames
Every 32 ip's
255.255.0.0
24. What is Layer 7 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
14 per network
Application
Bandwidth - Delay - reliability and Load
25. What is the Transport PDU called?
Packets
Every 8 ip's
Physical
Segments
26. What is the layer 4 PDU called?
255.255.255.128
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
/28
Segments
27. IEEE Standards: Fast Ethernet
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
110
IEEE 802.3u
R1(config)#router rip - R1(config-router)#version 2
28. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Closest multiple of the magic number that is not over the interesting octets number.
Every 4 ip's
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
Presentation
29. Subnetting: where do the networks break with a /26
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30. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Segments
14 per network
60
Query and other router responds with a REPLY packet.
31. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
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
Layer 2
32. Subnetting: where do the networks break with a /27
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33. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Every 8 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Switch forwards the frame as soon as it can
Pins 1+2 swap places with pins 3+6
34. 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.
Every 16 ip's
14 per network
Shortest path first - (SPF)
35. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
Layer 2
126 per network
Bellman-Ford
Packets
36. OSPF: What is the process used by OSPF to build a routing table (step by step)
Bandwidth - Delay - reliability and Load
Data-Link
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
255.255.255.252
37. What is the boot sequence for Cisco Routers?
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
1-65535
Periodic Updates of their routing table
180
38. Subnetting: where do the networks break with a /30
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39. What is the Network PDU called?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Packets
Switch forwards the frame as soon as it can
Transport
40. Subnetting: What is a 255.128.0.0 in prefix notation
2 hosts
180 seconds
/9
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
41. What is Layer 2 in the OSI Model?
2 - each port is it's own collision domain
Data-Link
R
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
42. What are the comands to set the clock rate in a serial connection?
2 - the bridge separates the collision domain
2 hosts
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
IEEE 802.3z
43. What is the metric for EIGRP
D
/9
Network
Bandwidth - Delay - reliability and Load
44. What is Layer 4 in the OSI Model?
62 per network
Packets
Every 16 ip's
Transport
45. Subnetting: What is a /30 in Decimal
Physical
Add the magic number to the network minus 1
255.255.255.252
DCE
46. Switching Methods: What is Cut-through?
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.
Data-Link
180
47. Rip: What is the command to enable Ripv2?
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Hop Count
R1(config)#router rip - R1(config-router)#version 2
48. What Layer does CDP operate at?
Closest multiple of the magic number that is not over the interesting octets number.
Layer 2
120
/24
49. Switching Methods: What is Store and Forward?
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
Switch forwards frame once it completely receives it
Session
Every 32 ip's
50. OSPF: What does OSPF use for its metric?
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
180 seconds
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1