Cisco Certified Network Associate (CCNA) Exam 1

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 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.
2 / 40
Which protocol provides secure communication over an unsecured network such as the Internet?
HTTPS
HTTP
Telnet
FTP

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.
3 / 40
What command is used to save the running configuration to the startup configuration on a Cisco router?
write memory
copy running-config startup-config
store running-config
save config

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.
4 / 40
What protocol is used to discover the MAC address of a device on a local network when the IP address is known?
ICMP
DHCP
DNS
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.
5 / 40
What does the 'ip nat inside source' command accomplish in NAT configuration?
Defines the inside global address
Defines the inside local address
Translates the inside global address to the inside local address
Translates the inside local address to 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).
6 / 40
Which protocol does OSPF use to discover neighboring routers and maintain adjacencies?
TCP
ICMP
UDP
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.
7 / 40
Which command displays the contents of the IP routing table on a Cisco router?
show ip interface
show ip route
show ip arp
show ip protocols

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.
8 / 40
Which command is used to display the interface status and protocol status on a Cisco router?
show interfaces
show running-config
show version
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.
9 / 40
What is the default subnet mask for a Class B IP address?
255.255.255.255
255.255.0.0
255.0.0.0
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.
10 / 40
Which command displays detailed information about all OSPF interfaces on a router?
show ip ospf
show ospf interfaces
show ip ospf interface
show ip ospf neighbor

Explanation:
The show ip ospf interface command displays detailed information about all OSPF-enabled interfaces on a router, including interface status, cost, and timers.
11 / 40
Which layer of the OSI model is responsible for end-to-end communication and error detection?
Network
Data Link
Physical
Transport

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.
12 / 40
Which protocol is used for exchanging routing information between autonomous systems?
BGP
OSPF
RIP
EIGRP

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.
13 / 40
Which protocol is used by a switch to discover the identity of devices attached to its ports?
DHCP
DNS
CDP
ARP

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.
14 / 40
What does the acronym MTU stand for in networking?
Maximum Transfer Unit
Maximum Transmission Unit
Minimum Transmission Unit
Minimum Transfer 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.
15 / 40
Which command is used to enable OSPF on a Cisco router?
ip ospf
enable ospf
set ospf
router 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.
16 / 40
Which of the following describes the function of a switch in a network?
Forwards packets based on IP address
Connects to the Internet
Creates a collision domain per port
Routes packets between different networks

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.
17 / 40
Which protocol operates at the network layer and is responsible for logical addressing and routing?
IP
UDP
TCP
ARP

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.
18 / 40
Which layer of the OSI model is responsible for data formatting and encryption?
Transport
Presentation
Session
Application

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.
19 / 40
Which address type does a DHCP server assign to a client on a network?
Link-local address
Dynamic IP address
Anycast address
Static IP 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.
20 / 40
Which feature allows a router to distribute its IP address assignments to hosts on a network?
DHCP
NAT
DNS
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.
21 / 40
Which feature does DHCP provide to a client?
IP address and MAC address
IP address and subnet mask
MAC address and default gateway
IP address and default gateway

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.
22 / 40
Which command would you use to display the running configuration on a Cisco router?
show startup-config
show running-config
show config
display running-config

Explanation:
The show running-config command displays the current configuration in use by the router. This is essential for verifying and troubleshooting configurations.
23 / 40
Which WAN technology uses fixed-size cells of 53 bytes?
ATM
Frame Relay
MPLS
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.
24 / 40
Which command is used to verify the current NAT translations on a Cisco router?
show ip nat translations
display nat mappings
show nat status
show ip mappings

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.
25 / 40
Which command is used to set a password for privileged EXEC mode on a Cisco router?
exec password
enable password
set password
enable secret

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 of the following represents the IPv6 loopback address?
2001::1
fe80::1
::
::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.
27 / 40
Which command is used to display all active IP sockets on a Cisco router?
show ip interface
show sockets
show ip sockets detail
show ip 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.
28 / 40
Which of the following is a characteristic of a static route?
Automatically adjusts to changes in the network
Defined manually by the network administrator
Uses higher CPU resources on the router
Is more complex to configure than dynamic routing protocols

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.
29 / 40
Which of the following is a classful routing protocol?
RIP v1
BGP
EIGRP
OSPF

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.
30 / 40
Which command is used to display the routing table on a Cisco router?
show running-config
show version
show interfaces
show ip route

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.
31 / 40
What is the primary purpose of a VLAN?
To increase the number of available IP addresses
To provide wireless connectivity
To separate broadcast domains
To increase the speed of the network

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.
32 / 40
Which layer of the OSI model is responsible for establishing, managing, and terminating sessions?
Application
Transport
Session
Presentation

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.
33 / 40
What is the default administrative distance of EIGRP?
120
100
110
90

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.
34 / 40
Which command is used to display the current configuration stored in NVRAM?
show nvram
show startup-config
show running-config
show 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.
35 / 40
Which protocol provides a mechanism for detecting and responding to network congestion?
TCP
UDP
ICMP
ARP

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.
36 / 40
Which command is used to assign an IP address to a Cisco router interface?
assign ip
set ip
ifconfig
ip address

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].
37 / 40
Which IPv4 address class allows for the most hosts per network?
Class A
Class D
Class C
Class B

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.
38 / 40
Which command is used to configure a static route on a Cisco router?
ip static
add static route
route add
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].
39 / 40
Which type of IPv6 address is equivalent to an IPv4 private address?
Link-Local
Unique Local
Multicast
Global Unicast

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.
40 / 40
Which IPv6 address type is used for one-to-many communication?
Multicast
Anycast
Broadcast
Unicast

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

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