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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. Subnetting: where do the networks break with a /25
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2. Subnetting: How many hosts per network if the subnet mask is 255.255.255.128
126 per network
Switch forwards the frame as soon as it can
Transport
Shortest path first - (SPF)
3. What is Layer 3 in the OSI Model?
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.
R
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
4. What is Layer 5 in the OSI Model?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
/24
Session
Packets
5. Subnetting: What is a 255.128.0.0 in prefix notation
DCE
Presentation
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
/9
6. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Shortest path first - (SPF)
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
Segments
R1(config)#router rip - R1(config-router)#version 2
7. EIGRP: What packet is used to propagate routing information?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Shortest path first - (SPF)
Add the magic number to the network minus 1
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
8. What is Layer 1 in the OSI Model?
Physical
255.255.255.224
120
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
9. EIGRP: What is the hello packet used for?
255.255.0.0
Layer 2
Router(config)#ip route {exit-interface}
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
10. Switching Methods: What is Cut-through?
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
D
Switch forwards the frame as soon as it can
R
11. Subnetting: where do the networks break with a /26
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12. Symbol for Rip on a Show ip route
Packets
R
1-65535
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
13. How many Collision domains are there on a with 1 switch 2 computers?
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14. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
R3(config)#router rip - R3(config-router)#network 192.168.1.2
IEEE 802.3
120
Application
15. What is the Transport PDU called?
D
Query and other router responds with a REPLY packet.
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Segments
16. Rip: What is the command to enable Ripv2?
R1(config)#router rip - R1(config-router)#version 2
Every 8 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)#
Transport
17. Rip Timers: How long is the default for Invalid timer.
180 seconds
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
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
18. Rip: how do hold down timers work?
100
Bellman-Ford
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
Query and other router responds with a REPLY packet.
19. EIGRP: What packet is used to search for networks?
Query and other router responds with a REPLY packet.
Segments
180
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
20. RIP: What is the default Administrative Distance?
IEEE 802.3u
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
/28
120
21. What is Layer 2 in the OSI Model?
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
Data-Link
D
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
22. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Every 64 ip's
126 per network
Network
23. 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
Closest multiple of the magic number that is not over the interesting octets number.
Transport
24. Rip and EIGRP use what to keep other routers aware of their status?
2 hosts
Periodic Updates of their routing table
60
Application
25. What is the layer 4 PDU called?
Every 64 ip's
110
Application
Segments
26. Rip Timers: How long is the default for Flush timer.
R3(config)#router rip - R3(config-router)#network 192.168.1.2
Every 32 ip's
60
255.255.255.252
27. IEEE Standards: Gibabit Ethernet (Fibre)
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Router(config)#ip route {network address} {subnet-mask}
IEEE 802.3z
28. Subnetting: where do the networks break with a /30
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29. CABLES: What is the T568A Pinout Standard?
Session
Frames
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Every 64 ip's
30. Name the TCP/IP Layers
62 per network
Every 128 ip's
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Frames
31. Subnetting: What is a /27 in Decimal
Frames
The metric is called cost - and refers to the speed of the port - IE 56kps = 1785 where Fast Ethernet = 1
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
255.255.255.224
32. RIP Timers: What is an Holddown Timer?
Layer 2
DCE
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
255.255.255.252
33. How many Collision domains are there on a with 1 hub and 1 bridge 2 computers?
2 hosts
2 - the bridge separates the collision domain
R
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
34. EIGRP: What is the range of Autonomous System numbers?
DCE
Segments
Bandwidth - Delay - reliability and Load
1-65535
35. EIGRP: What is the commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
1-65535
Frames
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
36. What is the boot sequence for Cisco Routers?
Switch forwards the frame as soon as it can
Network
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
14 per network
37. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
255.255.192.0
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
255.255.255.128
38. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
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)#
Physical
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
30 per network
39. RIP: What Algorithm is used in RIP>
1 - everything hooked to the hub is in the same collision domain
255.255.192.0
Bellman-Ford
Bandwidth - Delay - reliability and Load
40. What is the metric for RIP
Hop Count
Transport
Every 64 ip's
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
41. CABLES: What is the difference between T568A and T568B?
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.
Pins 1+2 swap places with pins 3+6
/22
42. Switching Methods: What is Fragment-free?
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
D
255.255.0.0
43. IEEE Standards: Ethernet
DCE
/22
IEEE 802.3
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
44. Name the OSI Layers
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Layer 2
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
180 seconds
45. Subnetting: What is a 255.255.252.0 in prefix notation
14 per network
/22
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
Network
46. Subnetting: What is a 255.255.255.240 in prefix notation
/28
Physical
60
Application
47. How do you find the magic number for subnetting?
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
256 - the interesting (non-255/0) number. IE: 255.240.0.0 the interesting number is 240
IEEE 802.3ab
48. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
14 per network
49. Subnetting: where do the networks break with a /27
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50. Subnetting: What is a /25 in Decimal
255.255.255.128
Query and other router responds with a REPLY packet.
2 hosts
IEEE 802.3