CCNA QUESTION PART2
Q. What is Subnetting? Why is it used?
A Used in IP Networks to break up larger networks into smaller subnetworks. It is used to reduce network traffic, Optimized network performance, and simplify management i.e. to identify and isolate network problems.
Q. How do you change the Enable Secret password to CCNA?
A: Router(config)# enable secret CCNA
Q. How many access-lists are possible on an interface per protocol?
A: There can be only one access list for in and one for out on each interface per protocol.
3. What happens to a packet which is not permitted in the access list?
A: There is an implicit deny any at the end of an access list. So if the packet is not explicitly permitted,
it will be dropped.
4. Which command is used to view what access-lists are on serial0 interface?
A: show interface serial0
Q. Which show interface serial 1 status statement indicates that the shutdown command has been
issued?
A: Serial 1 is administratively down, the line protocol is down.
Q. What are the access-list ranges for IP (standard and extended)?
A: 1-99 IP standard access list
100-199 IP extended access list
Q. What does the command “cdp timer 120” do?
A: Changes the cdp update time to 120 seconds?
Q. Which of the following are the frame-relay LMI types used in Cisco routers?
A: Cisco (Default)
ANSI
Q933a
Q. What is LMI?
A: Management information that tells current DLCI values, global or local significance, and the
status of virtual circuits.
Q. What commands could you enter to monitor Frame-relay activity on Cisco routers?
A: show interface s0
show frame-relay map
Q. You have network 145.100.0.0 with a subnet mask of 255.255.248.0. If an access list is applied to
address 145.100.8.0 with a wildcard mask of 0.0.7.255, what address range will it filter?
A: Just the 145.100.8.0 subnet
Q What are the 2 steps used to configure and access list?
A: Define the list using access-list command.
Enable an interface using the access-group command.
Q. What does the ipx maximum paths command do?
A: Allows you to forward IPX packets over multiple paths to improve load sharing.
Q. Which of the following protocols are used to get an IP address from a known MAC address?
A: RARP – Reverse Address Resolution Protocol.
Q You have an IP address of 153.50.6.27 and a subnet mask of 255.255.255.128. What is the class,
how many bits are being subnetted, and what is the broadcast address?
A: Class B, 9 bits, 153.50.6.127
Q. How do you display the ipx routing updates in or out between routers?
A: sh ipx traffic
57. How do you enable IPX on a router?
A: ipx routing, int e0, IPX network 77790, encapsulation arpa
Q. A Unique ID placed in the header of each frame as it travels the switch fabric with a userassigned
ID defined in each frame is known as?
A: Frame tagging
Q. Which OSI layer is responsible for putting 1s and 0s into a logical group?
A: Data Link
Q. Which OSI layer is responsible for addressing devices and routing through an internetwork?
A: Network
Q. Which layer is responsible for flow control, acknowledgment, and windowing?
A: Transport
Q What is the result of segmenting a network with a router into 2 segments?
A: It prevents one segment’s broadcasts from getting to the other segment.
Q. Which layer is responsible for coordinating communication between systems?
A: Session
Q. Which layer is responsible for negotiating data transfer syntax?
A: Presentation
Q. Which layer is responsible for synchronizing sending and receiving applications, identifying and
establishing the availability of the intended communication partner, and determining if sufficient
resources for the intended communication exists?
A: Application
Q. CPE is an acronym for what?
A: Customer Premises Equipment
Q. Which 2 statements are true about IP addressing?
A: A host portion of all 1’s indicates a network broadcast
IP addresses are four octets long and contain a network and a host portion.
Q. CSU/DSU is an acronym for which of the following?
A: Channel Service Unit - device that connects end-user equipment to the local digital telephone
loop.
Data Service Unit - used to adapt the physical interface on a DTE device to a circuit like T1. DSU
does the signal timing as well.
Q. Which IP host address range is allowable given an IP address of 169.73.3.55 using 12 bits of subnetting?
A: 169.73.3.49 through 169.73.3.62
Q. CO is an acronym for which of the following?
A: Central office
Q. What is cut-through switching?
A: Packet switching where data is exiting the switch at the same time it is still entering the inbound
port.
Q. Given an IP host address of 169.61.3.151 and a subnet mask of 255.255.255.192, which subnet
does this host belong to?
A: 169.61.3.128
Q. What does the Spanning-Tree Algorithm (STA) do?
A: Implemented by STP to prevent loops by creating a spanning tree.
Q. Of the different switching types, which one has the lowest latency?
A: Cut-Through
Q. Of the different switching types, which one has the highest latency?
A: Store-and-Forward
Q. To specify all hosts in the class B IP network 172.16.0.0, which wildcard access list mask would
you use?
A: 0.0.255.255
Q. IP extended access lists use what parameters as a basis for permitting or denying packets?
A: Source Address
Destination Address
Port Number
Protocol
Q. How would you specify only to check host 172.16.30.65 in an IP access list?
A: 172.16.30.65 0.0.0.0, or host 172.16.30.65
Q. How many valid host IP addresses are available on the following subnetwork?
167.21.41.17/30
A: 2
81. What is the port number used by TCP?
A: 6
Q. What is the port number used by UDP?
A: 17
Q. What does the acronym ARP stand for?
A: Address Resolution Protocol
Q. Which protocol derives a hardware address from a known IP address?
A: ARP
Q. Which protocol works at the Internet layer of the DOD model and is responsible for making
routing decisions?
A: IP
Q. Which port numbers are used by TCP and UDP to set up sessions with other hosts?
A: 1023 and above
Q. The User Datagram Protocol works at which layer of the DOD model?
A: Host-to-Host.
Q. Which protocol sends redirects back to an originating router?
A: Internet Control Message Protocol - ICMP
Q. Ping uses which Internet layer protocol?
A: ICMP
Q What does the following command do?
Router(config)# router igrp 101
A: Identifies IGRP as the routing protocol on autonomous system 101.
Q. Which protocols use the Transport layer?
A: TCP, UDP, and SPX.
Q Which of the following is a connectionless protocol that uses the Transport layer?
A: UDP
Q Which protocol is used for booting diskless workstations?
A: Bootstrap Protocol
Q. What command do you use to change your enable password?
A: Router(config)# enable password
Q. What command can you use to copy the configuration from NVRAM into running RAM?
A: copy startup-config running-config, or copy start run
Q. What is the syntax for changing the name of a Cisco router?
A: Hostname
Q To exit from privileged mode and go back to the user mode, what would you type at the privileged
mode prompt?
A: disable
A. Given the following description of OSI layers, choose the correct order that these statements are
listed in?
1) This layer segments and reassembles data into a data stream.
2) This layer manages device addressing, tracks the location of devices, and determines best
path.
3) This layer provides the physical transmission of the data and handles error notification
and flow control.
A: Transport, network, data link
A What is the auxiliary (AUX) port used for?
A: Modem connections for a console, or a dialup connection for temporary Dial on Demand Routing
(DDR)
100.How do you enable the advanced editing features?
A: terminal editing
Q.What keys do you use to view, from history, the last command that was entered into a Cisco
router?
A: CTRL+P
Q.What key do you press to have the Cisco IOS finish typing a command for you?
A: TAB
Q.What does the erase startup-config command do?
A: Erases the startup-configuration from NVRAM
Q.What is the command to set the clock rate on your DCE interfaces to 64 Kbps?
A: clock rate 64000 (not clockrate)
105.If you have two Cisco routers connected with DTE/DCE cables, to which router would you add
the command clock rate?
A: DCE
106 What is difference between Switch & Hub?
Switch:
Switches operate at Layer 2 Data Link Layer
Address Learning
Forward / Filter decision using MAC address
Loop Avoidance
Breakup collision domains
Switches create separate collision domains but a single broadcast domain
Hub:
Hub operates at Layer 1 Physical Layer
No Filtering
No Addressing
Hub creates single collision domain and single broadcast domain
Make forwarding to all the ports when signal is arrived
switch is an intelligent device
switch is a layer 2 protocol.
switch is a broadcast device it is a single broadcast multiple collision device,
switch can understand MAC address
hub is broadcasting device
hub is a layer 1 protocol
hub is a single broadcast single collision device.
A Used in IP Networks to break up larger networks into smaller subnetworks. It is used to reduce network traffic, Optimized network performance, and simplify management i.e. to identify and isolate network problems.
Q. How do you change the Enable Secret password to CCNA?
A: Router(config)# enable secret CCNA
Q. How many access-lists are possible on an interface per protocol?
A: There can be only one access list for in and one for out on each interface per protocol.
3. What happens to a packet which is not permitted in the access list?
A: There is an implicit deny any at the end of an access list. So if the packet is not explicitly permitted,
it will be dropped.
4. Which command is used to view what access-lists are on serial0 interface?
A: show interface serial0
Q. Which show interface serial 1 status statement indicates that the shutdown command has been
issued?
A: Serial 1 is administratively down, the line protocol is down.
Q. What are the access-list ranges for IP (standard and extended)?
A: 1-99 IP standard access list
100-199 IP extended access list
Q. What does the command “cdp timer 120” do?
A: Changes the cdp update time to 120 seconds?
Q. Which of the following are the frame-relay LMI types used in Cisco routers?
A: Cisco (Default)
ANSI
Q933a
Q. What is LMI?
A: Management information that tells current DLCI values, global or local significance, and the
status of virtual circuits.
Q. What commands could you enter to monitor Frame-relay activity on Cisco routers?
A: show interface s0
show frame-relay map
Q. You have network 145.100.0.0 with a subnet mask of 255.255.248.0. If an access list is applied to
address 145.100.8.0 with a wildcard mask of 0.0.7.255, what address range will it filter?
A: Just the 145.100.8.0 subnet
Q What are the 2 steps used to configure and access list?
A: Define the list using access-list command.
Enable an interface using the access-group command.
Q. What does the ipx maximum paths command do?
A: Allows you to forward IPX packets over multiple paths to improve load sharing.
Q. Which of the following protocols are used to get an IP address from a known MAC address?
A: RARP – Reverse Address Resolution Protocol.
Q You have an IP address of 153.50.6.27 and a subnet mask of 255.255.255.128. What is the class,
how many bits are being subnetted, and what is the broadcast address?
A: Class B, 9 bits, 153.50.6.127
Q. How do you display the ipx routing updates in or out between routers?
A: sh ipx traffic
57. How do you enable IPX on a router?
A: ipx routing, int e0, IPX network 77790, encapsulation arpa
Q. A Unique ID placed in the header of each frame as it travels the switch fabric with a userassigned
ID defined in each frame is known as?
A: Frame tagging
Q. Which OSI layer is responsible for putting 1s and 0s into a logical group?
A: Data Link
Q. Which OSI layer is responsible for addressing devices and routing through an internetwork?
A: Network
Q. Which layer is responsible for flow control, acknowledgment, and windowing?
A: Transport
Q What is the result of segmenting a network with a router into 2 segments?
A: It prevents one segment’s broadcasts from getting to the other segment.
Q. Which layer is responsible for coordinating communication between systems?
A: Session
Q. Which layer is responsible for negotiating data transfer syntax?
A: Presentation
Q. Which layer is responsible for synchronizing sending and receiving applications, identifying and
establishing the availability of the intended communication partner, and determining if sufficient
resources for the intended communication exists?
A: Application
Q. CPE is an acronym for what?
A: Customer Premises Equipment
Q. Which 2 statements are true about IP addressing?
A: A host portion of all 1’s indicates a network broadcast
IP addresses are four octets long and contain a network and a host portion.
Q. CSU/DSU is an acronym for which of the following?
A: Channel Service Unit - device that connects end-user equipment to the local digital telephone
loop.
Data Service Unit - used to adapt the physical interface on a DTE device to a circuit like T1. DSU
does the signal timing as well.
Q. Which IP host address range is allowable given an IP address of 169.73.3.55 using 12 bits of subnetting?
A: 169.73.3.49 through 169.73.3.62
Q. CO is an acronym for which of the following?
A: Central office
Q. What is cut-through switching?
A: Packet switching where data is exiting the switch at the same time it is still entering the inbound
port.
Q. Given an IP host address of 169.61.3.151 and a subnet mask of 255.255.255.192, which subnet
does this host belong to?
A: 169.61.3.128
Q. What does the Spanning-Tree Algorithm (STA) do?
A: Implemented by STP to prevent loops by creating a spanning tree.
Q. Of the different switching types, which one has the lowest latency?
A: Cut-Through
Q. Of the different switching types, which one has the highest latency?
A: Store-and-Forward
Q. To specify all hosts in the class B IP network 172.16.0.0, which wildcard access list mask would
you use?
A: 0.0.255.255
Q. IP extended access lists use what parameters as a basis for permitting or denying packets?
A: Source Address
Destination Address
Port Number
Protocol
Q. How would you specify only to check host 172.16.30.65 in an IP access list?
A: 172.16.30.65 0.0.0.0, or host 172.16.30.65
Q. How many valid host IP addresses are available on the following subnetwork?
167.21.41.17/30
A: 2
81. What is the port number used by TCP?
A: 6
Q. What is the port number used by UDP?
A: 17
Q. What does the acronym ARP stand for?
A: Address Resolution Protocol
Q. Which protocol derives a hardware address from a known IP address?
A: ARP
Q. Which protocol works at the Internet layer of the DOD model and is responsible for making
routing decisions?
A: IP
Q. Which port numbers are used by TCP and UDP to set up sessions with other hosts?
A: 1023 and above
Q. The User Datagram Protocol works at which layer of the DOD model?
A: Host-to-Host.
Q. Which protocol sends redirects back to an originating router?
A: Internet Control Message Protocol - ICMP
Q. Ping uses which Internet layer protocol?
A: ICMP
Q What does the following command do?
Router(config)# router igrp 101
A: Identifies IGRP as the routing protocol on autonomous system 101.
Q. Which protocols use the Transport layer?
A: TCP, UDP, and SPX.
Q Which of the following is a connectionless protocol that uses the Transport layer?
A: UDP
Q Which protocol is used for booting diskless workstations?
A: Bootstrap Protocol
Q. What command do you use to change your enable password?
A: Router(config)# enable password
Q. What command can you use to copy the configuration from NVRAM into running RAM?
A: copy startup-config running-config, or copy start run
Q. What is the syntax for changing the name of a Cisco router?
A: Hostname
Q To exit from privileged mode and go back to the user mode, what would you type at the privileged
mode prompt?
A: disable
A. Given the following description of OSI layers, choose the correct order that these statements are
listed in?
1) This layer segments and reassembles data into a data stream.
2) This layer manages device addressing, tracks the location of devices, and determines best
path.
3) This layer provides the physical transmission of the data and handles error notification
and flow control.
A: Transport, network, data link
A What is the auxiliary (AUX) port used for?
A: Modem connections for a console, or a dialup connection for temporary Dial on Demand Routing
(DDR)
100.How do you enable the advanced editing features?
A: terminal editing
Q.What keys do you use to view, from history, the last command that was entered into a Cisco
router?
A: CTRL+P
Q.What key do you press to have the Cisco IOS finish typing a command for you?
A: TAB
Q.What does the erase startup-config command do?
A: Erases the startup-configuration from NVRAM
Q.What is the command to set the clock rate on your DCE interfaces to 64 Kbps?
A: clock rate 64000 (not clockrate)
105.If you have two Cisco routers connected with DTE/DCE cables, to which router would you add
the command clock rate?
A: DCE
106 What is difference between Switch & Hub?
Switch:
Switches operate at Layer 2 Data Link Layer
Address Learning
Forward / Filter decision using MAC address
Loop Avoidance
Breakup collision domains
Switches create separate collision domains but a single broadcast domain
Hub:
Hub operates at Layer 1 Physical Layer
No Filtering
No Addressing
Hub creates single collision domain and single broadcast domain
Make forwarding to all the ports when signal is arrived
switch is an intelligent device
switch is a layer 2 protocol.
switch is a broadcast device it is a single broadcast multiple collision device,
switch can understand MAC address
hub is broadcasting device
hub is a layer 1 protocol
hub is a single broadcast single collision device.
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