CCNA 1: Module 16-17
Which statement describes the "ping" and "tracert" commands?
"Tracert" shows each hop, while "ping" shows a destination reply only
A network engineer is troubleshooting connectivity issues among interconnected Cisco routers and switches. Which command should the engineer use to find the IP address information, host name, and IOS version of neighboring network devices?
#show cdp neighbors detail
IP address given automatically by windows PC when a DHCP server cannot be reached
169.254.0.0/16 range
Virus
A piece of code that is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data. Attaches itself to an actual program. Requires manual intervention.
Routing Attacks
A threat actor could either place a rogue routing device on the network or modify routing packets to manipulate routers to send all packets to the chosen destination of the threat actor. (Can also use sinkholes)
SQL Injection
An attack that targets SQL servers by injecting commands to be manipulated by the database.
What is considered the most effective way to mitigate a worm attack?
Download security updates from the operating system vendor and patch all vulnerable systems.
A network technician issues the "C:/> tracert -6 www.cisco.com" command on a windows PC. What is the purpose of the "-6" command option?
It forces the trace to use IPv6
An administrator decides to use "WhatAreyouwaiting4" as the password on a newly installed router. Which statement applies to the password choice?
It is strong because it uses a passphrase
Which type of attack involves an adversary attempting to gather information about a network to identify vulnerabilities?
Reconnaissance
A technician is to document the current configurations of all network devices in a college, including those in off-site buildings. Which protocols would be best to use to securely access the network devices?
SSH
What information about a Cisco router can be verified using the "show version" command?
The value of the configuration register
eavesdropping attack
Type of attack is used either to steal content of the communication itself or gain information that will help the attacker later gain access to you network and resources
What is the difference between a virus and a worm?
Worms self-replicate but viruses do not.
Worm
a software program capable of reproducing itself that can spread from one computer to the next over a network
A network engineer is analyzing reports from a recently performed network baseline. Which situation would depict a possible latency issue?
an increase in host-to-host ping response times
A student wants to save a router configuration to NVRAM. What is the best command to use to accomplish the task?
copy running-config startup-config
A teacher is having difficulties connecting his PC to the classroom network. He needs to verify that a default gateway is configured correctly. What is the best command to use to accomplish the task?
ipconfig
A user wants to know the IP address of the PC. What is the best command to use to accomplish the task?
ipconfig
A support technician needs to know the IP address of the wireless interface on a MAC. What is the best command to use to accomplish the task?
ipconfig getifaddr en0
When applied to a router, which command would help mitigate brute-force password attacks against the router?
login block-for 60 attempts 5 within 60
Which example of malicious code would be classified as a Trojan horse?
malware that was written to look like a video game
Which attack involves a compromise of data that occurs between two end points?
man-in-the-middle attack
An administrator is troubleshooting connectivity issues and needs to determine the IP address of a website. What is the best command to use to accomplish the task?
nslookup
User are complaining that they are unable to browse certain websites on the internet. An administrator can successfully ping a web server via its IP address, but cannot browse the domain name of the website. Which troubleshooting tool would be most useful in determining where the problem is?
nslookup
Students who are connected to the same switch are having slower than normal response times. The administrator suspects a duplex setting issue. What is the best command to use to accomplish the task?
show interfaces
A network technician is troubleshooting an issue and needs to verify the IP addresses of all interfaces on a router. What is the best command to use to accomplish the task?
show ip interface brief
A network technician is troubleshooting an issue and needs to verify all the IPv6 interface addresses on a router. What is the best command to use to accomplish the task?
show ipv6 interface
Only employees connected to IPv6 interfaces are having difficulties connecting to remote networks. The analyst wants to verify that IPv6 has been enabled. What is the best command to use to accomplish the task?
show running-config
Which command can an administrator execute to determine what interface a router will use to reach remote networks?
show up route
Which firewall feature is used to ensure that packets coming into a network are legitimate responses to requests initiated from internal hosts?
stateful packet inspection
Which command can an administrator issue on a Cisco router to send debug messages to the vty lines?
terminal monitor
Which command should be used on a Cisco router or switch to allow log messages to be displayed on remotely connected sessions using Telnet or SSH?
terminal monitor
Why would a network administrator use the tracert utility?
to identify where a packet was lost or delayed on a network
What is the purpose of network security authentication function?
to require users to prove who they are
An employee complains that a Windows PC cannot connect to the internet. A network technician issues the ipconfig command on the pc and is shown an IP address of 169.254.10.3. Which two conclusions can be drawn? (Choose two.)
•The PC cannot contact a DHCP server. •The PC is configured to obtain an IP address automatically.
On which two interfaces or ports can security be improved by configuring executive timeouts? (Choose two.)
•console ports •vty ports
Rules for a Strong Passwords
•minimum of 8 characters, preferably 10 •use complex combinations of numbers, special characters, and upper and lower case letters •avoid repetition, common dictionary words, letter or number sequences •avoid names of relatives, pets, birthdays, or any easily identifiable personal information •can be created by misspelling words or replacing vowels with numbers or special characters
Which network service automatically assigns IP addresses to devices on the network?
DHCP
By following a structured troubleshooting approach, a network administrator identified a network issue after a conversation with the user. What is the next step that the administrator should take?
Establish a theory of probable causes.
A user reports a lack of network connectivity. The technician takes control of the user machine and attempts to ping other computers on the network and these pings fail. The technician pings the default gateway and that also fails. What can be determined for sure by the results of these tests?
Nothing can be determined for sure at this point.
A ping fails when performed from router R1 to directly connected router R2. The network administrator then proceeds to issue the show cdp neighbors command. Why would the network administrator issue this command if the ping failed between the two routers?
The network administrator wants to verify Layer 2 connectivity. Remember: The show cdp neighbors command can be used to prove that Layer 1 and Layer 2 connectivity exists between two Cisco devices. For example, if two devices have duplicate IP addresses, a ping between the devices will fail, but the output of show cdp neighbors will be successful. The show cdp neighbors detail could be used to verify the IP address of the directly connected device in case the same IP address is assigned to the two routers.
When configuring SSH on a router to implement secure network management, a network engineer has issued the "login local" and "transport input ssh" line vty commands. What three additional configuration actions have to be performed to complete the SSH configuration? (Choose three.)
•Generate the asymmetric RSA keys. •Configure the correct IP domain name. •Create a valid local username and password database.