Modules 16-17: Building and Securing a Small Network
Which statement is true about Cisco IOS ping indicators?
'U' may indicate that a router along the path did not contain a route to the destination address and that the ping was unsuccessful.
hich network service automatically assigns IP addresses to devices on the network?
DHCP
Which component is designed to protect against unauthorized communications to and from a computer?
Firewall
An administrator decides to use "5$7*4#033!" as the password on a newly installed router. Which statement applies to the password choice?
It is strong because it contains 10 numbers and special characters.
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.
An administrator decides to use "password" as the password on a newly installed router. Which statement applies to the password choice?
It is weak because it is a commonly used password.
n administrator decides to use "admin" as the password on a newly installed router. Which statement applies to the password choice?
It is weak because it is often the default password on new devices.
An administrator decides to use "12345678!" as the password on a newly installed router. Which statement applies to the password choice?
It is weak because it uses a series of numbers or letters.
An administrator decides to use "Elizabeth" as the password on a newly installed router. Which statement applies to the password choice?
It is weak because it uses easily found personal information.
Which command will block login attempts on routerA for a period of 30 seconds if there are 2 failed login attempts within 10 seconds
RouterA(Config)# login block-for 20 attempts 2 within 10
A technician is to document the current configurations of all network devices in a college, including those in off-site buildings. Which protocol would be best to use to securely access the network devices?
SSH
What is the advantage of using SSH over Telnet?
SSH provides secure communications to access hosts.
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 and The PC is configured to obtain an IP address automatically.
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.
Which statement describes the ping and tracert commands?
Tracert shows each hop, while ping shows a destination reply only.
What is the difference between a virus and a worm?
Worms self-replicate but viruses do not.
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
What is the role of an IPS?
detecting and blocking of attacks in real time
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
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
What feature of SSH makes it more secure than Telnet for a device management connection?
login information and data encryption
Which example of malicious code would be classified as a Trojan horse?
malware that was written to look like a video game
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
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
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
Which command can an administrator execute to determine what interface a router will use to reach remote networks?
show ip route
A network technician is troubleshooting an issue and needs to verify all of 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 difficulty connecting to remote networks. The analyst wants to verify that IPv6 routing has been enabled. What is the best command to use to accomplish the task?
show running-config
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
What information about a Cisco router can be verified using the show version command?
the value of the configuration register
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 and Configure the correct IP domain name and Create a valid local username and password database.
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
What is an accurate description of redundancy?
designing a network to use multiple paths between switches to ensure there is no single point of failure
A user is redesigning a network for a small company and wants to ensure security at a reasonable price. The user deploys a new application-aware firewall with intrusion detection capabilities on the ISP connection. The user installs a second firewall to separate the company network from the public network. Additionally, the user installs an IPS on the internal network of the company. What approach is the user implementing?
layered
Which attack involves a compromise of data that occurs between two end points?
man-in-the-middle attack
Users 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 to the domain name of the website. Which troubleshooting tool would be most useful in determining where the problem is?
nslookup
What is the purpose of the network security authentication function?
to require users to prove who they are
A network administrator is upgrading a small business network to give high priority to real-time applications traffic. What two types of network services is the network administrator trying to accommodate? (Choose two.)
voice video
An administrator decides to use "Feb121978" as the password on a newly installed router. Which statement applies to the password choice?
It is weak because it uses easily found personal information.
What is a characteristic of UDP?
UDP reassembles the received datagrams in the order they were received.
On which two interfaces or ports can security be improved by configuring executive timeouts? (Choose two.)
console ports and vty ports
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 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
What is the purpose of a small company using a protocol analyzer utility to capture network traffic on the network segments where the company is considering a network upgrade?
to document and analyze network traffic requirements on each network segment
Why would a network administrator use the tracert utility?
to identify where a packet was lost or delayed on a network
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.
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.
Which method is used to send a ping message specifying the source address for the ping?
Issue the ping command without specifying a destination IP address.
An administrator decides to use "pR3s!d7n&0" as the password on a newly installed router. Which statement applies to the password choice?
It is strong because it uses a minimum of 10 numbers, letters and special characters.
What is the purpose of the network security accounting function?
to keep track of the actions of a user
An administrator decides to use "RobErT" as the password on a newly installed router. Which statement applies to the password choice?
It is weak since it uses easily found personal information.
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.
Which type of attack involves an adversary attempting to gather information about a network to identify vulnerabilities?
reconnaissance
What type of attack may involve tthe use of tools such as nslookup and fping?
reconnaissance attack
