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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 commands to enable EIGRP for autonomous area 7 and to route network 192.168.1.0 /30
Segments
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
Frames
2. OSPF: What is the default administrative distance?
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
2 - the bridge separates the collision domain
110
120
3. Name the OSI Layers
62 per network
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
Data-Link
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
4. Subnetting: How many hosts per network if the subnet mask is 255.255.255.224
Periodic Updates of their routing table
Query and other router responds with a REPLY packet.
Shortest path first - (SPF)
30 per network
5. Subnetting: What is a 255.255.255.240 in prefix notation
/28
1. NVRAM - 2. Flash (sequential) - 3. TFTP server (network boot) - 4. ROM (partial IOS)
Router(config)#ip route {network address} {subnet-mask}
R1(config)#router eigrp 7 - R1(config-router)#network 192.168.1.0 0.0.0.3
6. Subnetting: where do the networks break with a /30
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7. Subnetting: where do the networks break with a /27
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8. What is Layer 4 in the OSI Model?
Physical
Query and other router responds with a REPLY packet.
Switch forwards frame once it completely receives it
Transport
9. RIP: Commands to enable ripv1 on a router and add a route to 192.168.1.2
Presentation
Every 32 ip's
R3(config)#router rip - R3(config-router)#network 192.168.1.2
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
10. OSPF: What Algorithm is used?
Every 8 ip's
Shortest path first - (SPF)
Bandwidth - Delay - reliability and Load
Session
11. What is Layer 7 in the OSI Model?
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
126 per network
Closest multiple of the magic number that is not over the interesting octets number.
Application
12. OSPF: Commands to enable OSPF area 0 and advertise network 10.1.1.1 /28
Session
R1(config)# router OSPF 1 - R1(config-router)#network 10.1.1.0 0.0.0.15 area 0
255.255.255.128
2 - each port is it's own collision domain
13. Using the magic number how to you figure the network?
Every 32 ip's
/22
Application
Closest multiple of the magic number that is not over the interesting octets number.
14. Command for a static route with exit interface
255.255.255.252
Segments
Router(config)#ip route {exit-interface}
Every 8 ip's
15. Subnetting: How many hosts per network if the subnet mask is 255.255.255.240
255.255.255.252
DCE
R3(config)#router rip - R3(config-router)#network 192.168.1.2
14 per network
16. Subnetting: What is a 255.255.252.0 in prefix notation
60
/22
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
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
17. Switching Methods: What is Fragment-free?
Bellman-Ford
100
Physical
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
18. EIGRP: What is the range of Autonomous System numbers?
Physical
1-65535
Packets
Switch forwards frame once it completely receives it
19. Subnetting: What is a /16 in Decimal
Switch forwards frame once it completely receives it
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)#
Frames
255.255.0.0
20. Rip: Command to prevent rip updates on an interface
IEEE 802.3z
Frames
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
180 seconds
21. What are the commands to setup SSH?
120
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)#
2 - each port is it's own collision domain
(7)Application -(6)Presentation -(5)Session -(4)Transport - (3)Network - (2)Data Link - (1)Physical
22. Switching Methods: What is Cut-through?
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
Switch forwards the frame as soon as it can
Periodic Updates of their routing table
23. OSPF: How does OSPF calulate the cost of each route - to figure out which way to go?
Query and other router responds with a REPLY packet.
1 - everything hooked to the hub is in the same collision domain
Switch forwards frame after receiving the 1st 64bytes to insure no errors.
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
24. What is the layer 3 PDU called?
Hop Count
Packets
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}
25. What is the layer 4 PDU called?
D
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
Segments
255.255.255.128
26. Command for a static route with 'Next Hop' Address
Router(config)#ip route {network address} {subnet-mask}
Every 32 ip's
Closest multiple of the magic number that is not over the interesting octets number.
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)#
27. Name the TCP/IP Layers
2 hosts
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
(5)Application - (4)Transport - (3)Internet - (2)Data-Link - (1)Physical
Network
28. How many Collision domains are there on a with 1 hub and 2 computers?
R
1:O/W - 2:Orange - 3:G/W - 4:Blue - 5:B/W - 6:Green - 7:Brown/W - 8:Brown
Switch forwards the frame as soon as it can
1 - everything hooked to the hub is in the same collision domain
29. RIP: What is the default Administrative Distance?
2 - each port is it's own collision domain
120
30 per network
255.255.192.0
30. Subnetting: What is a /25 in Decimal
255.255.255.128
Bellman-Ford
255.255.255.224
Physical
31. What gets the clock rate - DCE or DTE?
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)#
DCE
30 per network
Frames
32. Subnetting: where do the networks break with a /25
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33. EIGRP: What is the name of the algorithm used for EIGRP?
DUAL: Difusing Update Algorithm
Data-Link
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Every 16 ip's
34. Rip: What does v2 have that v1 does not?
Every 32 ip's
Multicast packet used for discovery of neighbors sent every 5 seconds - on WAN links sent every 60 seconds
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
Shortest path first - (SPF)
35. What is Layer 3 in the OSI Model?
/28
Network
Transport
120
36. IEEE Standards: Gibabit Ethernet (Copper)
IEEE 802.3ab
Packets
Add the magic number to the network minus 1
/9
37. Rip: What causes a triggered update?
2 - each port is it's own collision domain
100
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
1 - everything hooked to the hub is in the same collision domain
38. EIGRP: What packet is used to propagate routing information?
255.255.0.0
Every 4 ip's
Can be multicast or unicast depending on number of routers - Update packets. Responds with an ACK packet
1:G/W - 2:Green - 3:O/W - 4:Blue - 5:B/W - 6:Orange - 7:Brown/W - 8:Brown
39. Subnetting: where do the networks break with a /28
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40. EIGRP: What is the default administrative distance?
Segments
100
Transport
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
41. What is the metric for EIGRP
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
1. Discovery packets - LSP built containing the state of each link - Flood LSP to neighbors - Build Link-state database
Bandwidth - Delay - reliability and Load
Transport
42. OSPF: how do you change the cost of an interface for OSPF?
Use command bandwidth {bandwidth in KPS} or the command ip ospf cost {amount} both in the interface you want to change
DUAL: Difusing Update Algorithm
255.255.0.0
Includes sub-net mask in updates making it classless - has authentication - supports variable length subnet mask - uses multicast instead of broadcast - supports manual summarization
43. Subnetting: How many hosts per network if the subnet mask is 255.255.255.192
Network
62 per network
Frames
Segments
44. What is the layer 2 PDU called?
Frames
Add the magic number to the network minus 1
Closest multiple of the magic number that is not over the interesting octets number.
Every 32 ip's
45. EIGRP: What packet is used to search for networks?
IEEE 802.3u
Show ip eigrp topology
Query and other router responds with a REPLY packet.
Layer 2
46. What is Layer 5 in the OSI Model?
Session
Router(config)# router rip - Router(config-router)# passive-interface fa0/0
R1(config)#int s0/0 - R1(config-inf)clock rate 64000 <-- on the DCE
Interface changes state (up/down) - A route has entered or exited the unreachable state - a route was installed in the routing table.
47. What is Layer 6 in the OSI Model?
Bandwidth - Delay - reliability and Load
Presentation
255.255.255.224
Every 16 ip's
48. Rip Timers: How long is the default for Flush timer.
D
Every 128 ip's
60
Bandwidth - Delay - reliability and Load
49. What is Layer 1 in the OSI Model?
Session
Packets
Physical
2 hosts
50. Subnetting: What is a /30 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
255.255.255.252
Session
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.