Some routers and switches in a wiring closet malfunctioned after an air conditioning unit failed. What type of threat does this situation describe?
The four classes of threats are as follows:
Hardware threats – physical damage to servers, routers, switches, cabling plant, and workstations
Environmental threats – temperature extremes (too hot or too cold) or humidity extremes (too wet or too dry)
Electrical threats – voltage spikes, insufficient supply voltage (brownouts), unconditioned power (noise), and total power loss
Maintenance threats – poor handling of key electrical components (electrostatic discharge), lack of critical spare parts, poor cabling, and poor labeling
What is the purpose of the network security authentication function?
Authentication, authorization, and accounting are network services collectively known as AAA. Authentication requires users to prove who they are. Authorization determines which resources the user can access. Accounting keeps track of the actions of the user.
Which two steps are required before SSH can be enabled on a Cisco router? (Choose two.)
There are four steps to configure SSH on a Cisco router. First, set the host name and domain name. Second, generate a set of RSA keys to be used for encrypting and decrypting the traffic. Third, create the user IDs and passwords of the users who will be connecting. Lastly, enable SSH on the vty lines on the router. SSH does not need to be set up on any physical interfaces, nor does an external authentication server need to be used. While it is a good idea to configure a banner to display legal information for connecting users, it is not required to enable SSH.
Refer to the exhibit. An administrator is trying to troubleshoot connectivity between PC1 and PC2 and uses the tracert command from PC1 to do it. Based on the displayed output, where should the administrator begin troubleshooting?
Tracert is used to trace the path a packet takes. The only successful response was from the first device along the path on the same LAN as the sending host. The first device is the default gateway on router R1. The administrator should therefore start troubleshooting at R1.
What is the purpose of issuing the commands cd nvram: then dir at the privilege exec mode of a router?
Which type of network threat is intended to prevent authorized users from accessing resources?
Network reconnaissance attacks involve the unauthorized discovery and mapping of the network and network systems. Access attacks and trust exploitation involve unauthorized manipulation of data and access to systems or user privileges. DoS, or Denial of Service attacks, are intended to prevent legitimate users and devices from accessing network resources.
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?
The terminal monitor command is very important to use when log messages appear. Log messages appear by default when a user is directly consoled into a Cisco device, but require the terminal monitor command to be entered when a user is accessing a network device remotely.
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?
The -6 option in the command C:\> tracert -6 www.cisco.com is used to force the trace to use IPv6.
Match the type of information security threat to the scenario. (Not all options are used.)
After an intruder gains access to a network, common network threats are as follows:
Data loss or manipulation
Disruption of service
Cracking the password for a known username is a type of access attack.
A network administrator for a small campus network has issued the show ip interface brief command on a switch. What is the administrator verifying with this command?
The show ip interface brief command is used to verify the status and IP address configuration of the physical and switch virtual interfaces (SVI).
Which command will backup the configuration that is stored in NVRAM to a TFTP server?
A newly hired network technician is given the task of ordering new hardware for a small business with a large growth forecast. Which primary factor should the technician be concerned with when choosing the new devices?
In a small business with a large growth forecast, the primary influencing factor would be the ability of devices to support modularity. Devices with a fixed type/number of interfaces would not support growth. Redundancy is an important factor, but typically found in large enterprises. Network monitoring is also an important consideration, but not as important as modularity.
A network administrator for a small company is contemplating how to scale the network over the next three years to accommodate projected growth. Which three types of information should be used to plan for network growth? (Choose three.)
Several elements that are needed to scale a network include documentation of the physical and logical topology, a list of devices that are used on the network, and an analysis of the traffic on the network.
A network technician issues the arp -d * command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued?
Issuing the arp –d * command on a PC will clear the ARP cache content. This is helpful when a network technician wants to ensure the cache is populated with updated information.
Which two traffic types require delay sensitive delivery? (Choose two.)
Voice and video traffic have delay sensitive characteristics and must be given priority over other traffic types such as web, email, and file transfer traffic.
Which statement is true about CDP on a Cisco device?
CDP is a Cisco-proprietary protocol that can be disabled globally by using the no cdp run global configuration command, or disabled on a specific interface, by using the no cdp enable interface configuration command. Because CDP operates at the data link layer, two or more Cisco network devices, such as routers can learn about each other even if Layer 3 connectivity does not exist. The show cdp neighbors detail command reveals the IP address of a neighboring device regardless of whether you can ping the neighbor.
When should an administrator establish a network baseline?
An effective network baseline can be established by monitoring the traffic at regular intervals. This allows the administrator to take note when any deviance from the established norm occurs in the network.
Which network design consideration would be more important to a large corporation than to a small business?
Small businesses today do need Internet access and use an Internet router to provide this need. A switch is required to connect the two host devices and any IP phones or network devices such as a printer or a scanner. The switch may be integrated into the router. A firewall is needed to protect the business computing assets. Redundancy is not normally found in very small companies, but slightly larger small companies might use port density redundancy or have redundant Internet providers/links.
Fill in the blank. Do not use abbreviations.
The show __ command provides information about the amount of free nvram and flash memory with the permissions for reading or writing data.
Which firewall feature is used to ensure that packets coming into a network are legitimate responses initiated from internal hosts?
Stateful packet inspection on a firewall checks that incoming packets are actually legitimate responses to requests originating from hosts inside the network. Packet filtering can be used to permit or deny access to resources based on IP or MAC address. Application filtering can permit or deny access based on port number. URL filtering is used to permit or deny access based on URL or on keywords.
Refer to the exhibit. Baseline documentation for a small company had ping round trip time statistics of 36/97/132 between hosts H1 and H3. Today the network administrator checked connectivity by pinging between hosts H1 and H3 that resulted in a round trip time of 1458/2390/6066. What does this indicate to the network administrator?
Ping round trip time statistics are shown in milliseconds. The larger the number the more delay. A baseline is critical in times of slow performance. By looking at the documentation for the performance when the network is performing fine and comparing it to information when there is a problem, a network administrator can resolve problems faster.
Fill in the blank. Do not use abbreviations.
The __ command that is issued on a router is used to verify the value of the software configuration register.
The show version command that is issued on a router displays the value of the configuration register, the Cisco IOS version being used, and the amount of flash memory on the device, among other information.
A network administrator is issuing the login block-for 180 attempts 2 within 30 command on a router. Which threat is the network administrator trying to prevent?
The login block-for 180 attempts 2 within 30 command will cause the device to block authentication after 2 unsuccessful attempts within 30 seconds for a duration of 180 seconds. A device inspecting the traffic on a link has nothing to do with the router. The router configuration cannot prevent unauthorized access to the equipment room. A worm would not attempt to access the router to propagate to another part of the network.
What is the purpose of using SSH to connect to a router?
Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer? (Choose two.)
Traffic flow patterns should be gathered during peak utilization times to get a good representation of the different traffic types. The capture should also be performed on different network segments because some traffic will be local to a particular segment.
Which two actions can be taken to prevent a successful network attack on an email server account? (Choose two.)
One of the most common types of access attack uses a packet sniffer to yield user accounts and passwords that are transmitted as clear text. Repeated attempts to log in to a server to gain unauthorized access constitute another type of access attack. Limiting the number of attempts to log in to the server and using encrypted passwords will help prevent successful logins through these types of access attack.