Cisco Certified Network Associate (CCNA) Exam 1 Past Questions and Answers

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Cisco Certified Network Associate (CCNA) Exam 1

Cisco Certified Network Associate (CCNA) Exam 1
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1 / 40
Which type of IPv6 address is equivalent to an IPv4 private address?
Global Unicast
Multicast
Unique Local
Link-Local

Explanation:
Unique Local IPv6 addresses are similar to IPv4 private addresses. They are meant for local communication within a site or a group of sites, not meant to be routable on the global Internet. These addresses start with the prefix FC00::/7.
2 / 40
Which layer of the OSI model is responsible for establishing, managing, and terminating sessions?
Presentation
Session
Application
Transport

Explanation:
The Session layer (Layer 5) of the OSI model is responsible for establishing, managing, and terminating sessions between applications. It coordinates communication between systems and manages data exchange.
3 / 40
Which protocol provides secure communication over an unsecured network such as the Internet?
FTP
HTTP
HTTPS
Telnet

Explanation:
HTTPS (Hypertext Transfer Protocol Secure) provides secure communication over an unsecured network by using SSL/TLS protocols to encrypt data. It ensures confidentiality and integrity of the data transmitted.
4 / 40
What is the primary purpose of a VLAN?
To increase the speed of the network
To increase the number of available IP addresses
To provide wireless connectivity
To separate broadcast domains

Explanation:
VLANs (Virtual Local Area Networks) are used to separate broadcast domains within a switch. This segmentation improves network efficiency and security by limiting broadcast traffic and isolating network segments.
5 / 40
Which command is used to verify the current NAT translations on a Cisco router?
display nat mappings
show ip mappings
show ip nat translations
show nat status

Explanation:
The show ip nat translations command displays the current Network Address Translation (NAT) translations on a Cisco router. It shows the mapping between local and global IP addresses.
6 / 40
Which protocol provides a mechanism for detecting and responding to network congestion?
ICMP
ARP
TCP
UDP

Explanation:
TCP (Transmission Control Protocol) includes mechanisms for detecting and responding to network congestion. These mechanisms include window size adjustments and retransmission strategies to ensure reliable data transfer.
7 / 40
Which command is used to enable OSPF on a Cisco router?
router ospf
enable ospf
set ospf
ip ospf

Explanation:
The router ospf command is used to enable OSPF (Open Shortest Path First) routing on a Cisco router. It is followed by the process ID, which is a locally significant identifier for the OSPF process.
8 / 40
What protocol is used to discover the MAC address of a device on a local network when the IP address is known?
ICMP
DNS
DHCP
ARP

Explanation:
ARP (Address Resolution Protocol) is used to map a known IP address to a MAC address on a local network. When a device wants to communicate with another device, it broadcasts an ARP request for the MAC address corresponding to the known IP address. The device with the IP address responds with its MAC address.
9 / 40
Which feature allows a router to distribute its IP address assignments to hosts on a network?
DNS
DHCP
NAT
ARP

Explanation:
DHCP (Dynamic Host Configuration Protocol) allows a router or dedicated DHCP server to dynamically assign IP addresses and other network configuration parameters to hosts on a network.
10 / 40
Which protocol does OSPF use to discover neighboring routers and maintain adjacencies?
TCP
UDP
ICMP
Hello Protocol

OSPF (Open Shortest Path First) uses Hello packets as part of its Hello Protocol to discover and maintain neighbor relationships. These packets are sent periodically out of all OSPF-enabled interfaces. If a router receives a Hello packet from a new neighbor, it will reply with its own Hello packet, and an adjacency will begin to form. If a router does not receive a Hello packet from an already known neighbor within a certain interval, it will consider that neighbor down.
11 / 40
Which of the following is a characteristic of a static route?
Is more complex to configure than dynamic routing protocols
Uses higher CPU resources on the router
Automatically adjusts to changes in the network
Defined manually by the network administrator

Explanation:
Static routes are manually configured by the network administrator and do not change unless manually altered. They do not automatically adjust to changes in the network, which is a characteristic of dynamic routing protocols.
12 / 40
Which of the following describes the function of a switch in a network?
Forwards packets based on IP address
Creates a collision domain per port
Routes packets between different networks
Connects to the Internet

Explanation:
A switch creates a separate collision domain for each port, which reduces collisions and improves network efficiency. It operates at the Data Link layer and forwards frames based on MAC addresses.
13 / 40
What is the default subnet mask for a Class B IP address?
255.255.255.255
255.0.0.0
255.255.0.0
255.255.255.0

Explanation:
The default subnet mask for a Class B IP address is 255.255.0.0. Class B addresses range from 128.0.0.0 to 191.255.255.255.
14 / 40
Which command is used to display the current configuration stored in NVRAM?
show nvram
show startup-config
show config
show running-config

Explanation:
The show startup-config command displays the configuration stored in NVRAM. This is the configuration that will be loaded when the router is rebooted.
15 / 40
Which command displays the contents of the IP routing table on a Cisco router?
show ip route
show ip protocols
show ip interface
show ip arp

Explanation:
The show ip route command displays the contents of the IP routing table, including all known routes, their source, and their current status. This is crucial for understanding the routing decisions made by the router.
16 / 40
Which WAN technology uses fixed-size cells of 53 bytes?
ATM
MPLS
Frame Relay
PPP

Explanation:
Asynchronous Transfer Mode (ATM) uses fixed-size cells of 53 bytes. This includes a 5-byte header and a 48-byte payload. This fixed cell size allows ATM to be a fast and predictable networking technology, suitable for both voice and data communications.
17 / 40
Which protocol is used for exchanging routing information between autonomous systems?
EIGRP
RIP
BGP
OSPF

Explanation:
BGP (Border Gateway Protocol) is used for exchanging routing information between autonomous systems on the Internet. It is essential for maintaining a consistent and accurate view of network paths.
18 / 40
What is the default administrative distance of EIGRP?
100
120
90
110

Explanation:
The default administrative distance for EIGRP (Enhanced Interior Gateway Routing Protocol) is 90 for internal routes. Administrative distance is a measure of the trustworthiness of a routing source; the lower the value, the more preferred the route.
19 / 40
Which feature does DHCP provide to a client?
IP address and default gateway
IP address and subnet mask
MAC address and default gateway
IP address and MAC address

Explanation:
DHCP (Dynamic Host Configuration Protocol) provides a client with an IP address, subnet mask, default gateway, and other network configuration parameters. The primary purpose is to assign an IP address and the necessary configuration to make the device operational in the network.
20 / 40
Which command is used to configure a static route on a Cisco router?
route add
ip static
add static route
ip route

Explanation:
The ip route command is used to configure static routes on a Cisco router. The syntax is ip route [destination network] [subnet mask] [next hop IP address or exit interface].
21 / 40
Which layer of the OSI model is responsible for end-to-end communication and error detection?
Data Link
Physical
Transport
Network

Explanation:
The Transport layer (Layer 4) of the OSI model is responsible for end-to-end communication, flow control, error detection, and correction. Protocols like TCP (Transmission Control Protocol) operate at this layer.
22 / 40
Which of the following is a classful routing protocol?
OSPF
BGP
EIGRP
RIP v1

Explanation:
RIP v1 (Routing Information Protocol version 1) is a classful routing protocol, meaning it does not send subnet mask information in its routing updates and assumes the default classful subnet mask.
23 / 40
Which command is used to assign an IP address to a Cisco router interface?
assign ip
ip address
ifconfig
set ip

Explanation:
The ip address command is used to assign an IP address and subnet mask to an interface on a Cisco router. The syntax is ip address [IP address] [subnet mask].
24 / 40
Which IPv4 address class allows for the most hosts per network?
Class D
Class B
Class C
Class A

Explanation:
Class A IPv4 addresses allow for the most hosts per network, with a range from 1.0.0.0 to 126.0.0.0. This class provides 24 bits for host addresses, allowing for over 16 million hosts per network.
25 / 40
Which command is used to set a password for privileged EXEC mode on a Cisco router?
set password
exec password
enable secret
enable password

Explanation:
The enable secret command is used to set an encrypted password for privileged EXEC mode on a Cisco router. This provides a higher level of security compared to the enable password command, which sets an unencrypted password.
26 / 40
Which address type does a DHCP server assign to a client on a network?
Anycast address
Static IP address
Dynamic IP address
Link-local address

Explanation:
A DHCP (Dynamic Host Configuration Protocol) server assigns dynamic IP addresses to clients on a network. This allows for efficient management of IP address allocation without manual intervention.
27 / 40
Which command displays detailed information about all OSPF interfaces on a router?
show ip ospf neighbor
show ip ospf
show ip ospf interface
show ospf interfaces

Explanation:
The show ip ospf interface command displays detailed information about all OSPF-enabled interfaces on a router, including interface status, cost, and timers.
28 / 40
Which command is used to create a static NAT mapping on a Cisco router?
ip nat inside source static
nat inside source static
ip nat pool static
nat static

Explanation:
The ip nat inside source static command creates a static NAT mapping on a Cisco router. It maps a specific inside local IP address to a specific inside global IP address.
29 / 40
Which command is used to display all active IP sockets on a Cisco router?
show ip interface
show ip sockets detail
show ip sockets
show sockets

Explanation:
The show ip sockets command displays all active IP sockets on a Cisco router. This includes information about current connections and their status.
30 / 40
What command is used to save the running configuration to the startup configuration on a Cisco router?
save config
store running-config
copy running-config startup-config
write memory

Explanation:
The command copy running-config startup-config saves the current configuration (running configuration) to the non-volatile memory (NVRAM) as the startup configuration. This ensures that the configuration is retained after a reboot.
31 / 40
Which of the following represents the IPv6 loopback address?
2001::1
::
::1
fe80::1

Explanation:
The IPv6 loopback address is ::1. It is used to test the local TCP/IP stack and functions similarly to the IPv4 loopback address 127.0.0.1.
32 / 40
Which command is used to display the interface status and protocol status on a Cisco router?
show version
show running-config
show interfaces
show ip route

Explanation:
The show interfaces command provides detailed information about all the interfaces on a Cisco device, including their status, protocol status, bandwidth, and other key metrics. This is essential for troubleshooting and monitoring network performance.
33 / 40
Which command would you use to display the running configuration on a Cisco router?
show config
show running-config
display running-config
show startup-config

Explanation:
The show running-config command displays the current configuration in use by the router. This is essential for verifying and troubleshooting configurations.
34 / 40
What does the 'ip nat inside source' command accomplish in NAT configuration?
Translates the inside global address to the inside local address
Defines the inside local address
Translates the inside local address to the inside global address
Defines the inside global address

Explanation:
The ip nat inside source command translates the inside local address (the address assigned to an internal device) to an inside global address (the address assigned by the NAT router to represent the internal device to the external network). This is a key function of Network Address Translation (NAT).
35 / 40
Which IPv6 address type is used for one-to-many communication?
Anycast
Unicast
Broadcast
Multicast

Explanation:
In IPv6, multicast addresses are used for one-to-many communication, where a single packet is delivered to multiple destinations. IPv6 does not use broadcast addresses, and multicast replaces this functionality.
36 / 40
Which layer of the OSI model is responsible for data formatting and encryption?
Application
Session
Presentation
Transport

Explanation:
The Presentation layer (Layer 6) of the OSI model is responsible for data formatting, encryption, and compression. It ensures that data is presented in a readable format for the Application layer.
37 / 40
Which protocol operates at the network layer and is responsible for logical addressing and routing?
ARP
IP
TCP
UDP

Explanation:
IP (Internet Protocol) operates at the Network layer (Layer 3) of the OSI model. It is responsible for logical addressing (IP addresses) and routing packets between hosts across different networks.
38 / 40
What does the acronym MTU stand for in networking?
Minimum Transfer Unit
Maximum Transfer Unit
Minimum Transmission Unit
Maximum Transmission Unit

Explanation:
MTU (Maximum Transmission Unit) refers to the largest size packet or frame that can be sent in a packet- or frame-based network, such as Ethernet. It is important for efficient and reliable communication.
39 / 40
Which protocol is used by a switch to discover the identity of devices attached to its ports?
ARP
CDP
DHCP
DNS

Explanation:
CDP (Cisco Discovery Protocol) is used by Cisco devices to discover the identity of other Cisco devices attached to its ports. It provides information about the type of device, software version, and IP address, among other details.
40 / 40
Which command is used to display the routing table on a Cisco router?
show version
show ip route
show running-config
show interfaces

Explanation:
The show ip route command displays the routing table on a Cisco router. This table includes routes to different network destinations, learned from various routing protocols, static routes, and directly connected networks.
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Cisco Certified Network Associate (CCNA) Exam 1 Past Questions and Answers

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