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The company is setting up a new website that will be requiring a lot of interaction with external users. The website needs to be accessible both externally and internally but without allowing access to internal resources. Which of the following would MOST likely be configured on the firewall?
DMZ is a physical or logical subnetwork that contains and exposes an organization’s external-facing services to a larger and untrusted network, usually the Internet. The purpose of a DMZ is to add an additional layer of security to an organization’s local area network (LAN); an external attacker only has access to equipment in the DMZ, rather than any other part of the network.
Which of the following attacks would allow an intruder to do port mapping on a company’s internal server from a separate company server on the Internet?
A. SYN flood
D. FTP bounce
FTP bounce attack is an exploit of the FTP protocol whereby an attacker is able to use the PORT command to request access to ports indirectly through the use of the victim machine as a middle man for the request.
Which of the following would be used to check whether a DoS attack is taking place from a specific remote subnet?
A. Syslog files
C. Network sniffer
A network sniffers monitors data flowing over computer network links. It can be a self-contained software program or a hardware device with the appropriate software or firmware programming.
A network technician has just upgraded a switch. The new switch’s IP range and subnet mask correctly match other network devices. The technician cannot ping any device outside of the switch’s own IP subnet. The previous switch worked correctly with the same settings. Which of the following is MOST likely the problem?
A. The proxy server is set incorrectly.
B. The Ethernet cable is pinched.
C. The network gateway is set incorrectly.
D. The IP address is set incorrectly.
When user is able to ping everything in its own subnet that means that all the hosts are reachable however when you are not able to ping anything outside of this subnet then pleasecheck if the device is sending traffic to the correct host who should forward it to the further devices.
Joe has a small office and is looking to replace his phone system with a lower cost solution that requires minimal in-house support. Which of the following is the BEST choice?
A. Wide Area Network
C. Virtual PBX
D. Virtual LAN
Virtual PBX,a business phone system providing call routing, follow-me calling, voice-mail, fax-mail, and ACD queues with no customer installed equipment.
An unusual amount of activity is coming into one of the switches in an IDF. A malware attack is suspected. Which of the following tools would appropriately diagnose the problem?
A. Cable tester
B. Protocol analyzer
C. Load balancer
A packet analyzer is a computer program or a piece of computer hardware that can intercept and log traffic passing over a digital network or part of a network.As data streams flow across the network, the sniffer captures eachpacket and, if needed, decodes the packet’s raw data, showing the values of various fields in the packet, and analyzes its content.
Joe, a user, has a computer that has a link light on his network interface card (NIC); however, Joe is unable to access the Internet. Which of the following is the cause of this issue?
A. Faulty GBIC
B. Faulty SFP
C. Cable is a crossover
D. VLAN mismatch
As user has link light on NIC that means he has connectivity with switch so he need to check his vlan assignment.
Which of the following can a network technician change to help limit war driving?
A. Signal strength
War driving is a term used to describe the process of a hacker who, armed with a laptop and a wireless adapter card and traveling via a car, bus, subway train, or other form of mechanized transport, goes around sniffing for WLANs. Over time, the hacker builds up a database comprising the network name, signal strength, location, and ip/namespace in use..
Which of the following is an example of a CSMA/CD medium?
C. Token ring
Explanation: CSMA/CDis a Media Access Control method in which a carrier sensing scheme is used and also a transmitting data station that detects another signal while transmitting a frame, stops transmitting that frame, transmits a jam signal, and then waits for a random time interval before trying to resend the frame
Which of the following performance optimization techniques would be MOST beneficial for a network-wide VoIP setup? (Select TWO).
A. Proxy server
B. Traffic shaping
C. Caching engines
D. Load balancing
E. Quality of service
Traffic shaping retains excess packets in a queue and then schedules the excess for later transmission over increments of time. The result of traffic shaping is a smoothed packet output rate. QoS (Quality of Service) is a major issue in VOIP implementations. The issue is how to guarantee that packet traffic for a voice or other media connection will not be delayed or dropped due interference from other lower priority traffic.
Things to consider are:
Latency: Delay for packet delivery
Jitter: Variations in delay of packet delivery
Packet loss: Too much traffic in the network causes the network to drop packets Burstiness of Loss and Jitter: Loss and Discards (due to jitter) tend to occur in bursts
A network technician is troubleshooting signal problems with certain WAPs in an office and finds consistently high ping times across the units. Such an issue is called which of the following?
D. Frequency hopping
During the high ping time users are using most of the bandwidth that causes latency so signal strength get affected by this.
A customer has requested a solution using multiple WAPs for wireless access. Which of the following should be different on each WAP to prevent wireless problems?
D. Antenna types
Protocol requires 16.25 to 22 MHz of channel separation (as shown above), adjacent channels overlap and will interfere with each other.
Channels 1, 6, and 11 are the most common channels to choose, and most routers will use one of them as the default channel–but the general idea is to be as far away from everybody else as you can.
Which of the following ports would have to be allowed through a firewall for POP3 traffic to pass on its default port?
Post Office Protocol (POP) is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. POP3 server listens on well-known port 110.
Which of the following copper cable types should be chosen to run gigabit speeds through a dropped ceiling that returns airflow?
A. Non-Plenum CAT5
B. Non-Plenum CAT5e
C. Plenum CAT5
D. Plenum CAT5e
Cat 5eis a twisted pair cablefor carrying signals. This type of cable is used in structured cabling for computer networks such as Ethernet. The cable standard provides performance of up to 100 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet).
Management has decided that they want a high level of security. They do not want Internet requests coming directly from users. Which of the following is the BEST recommendation?
A. Content filter
B. Proxy server
C. Layer 3 switch
A proxy server is a server (a computer system or an application) that acts as an intermediary for requests fromclients seeking resources from other servers.
Management wants to be sure that the existing wiring infrastructure conforms to CAT5e standards.
Which of the following is the correct tool?
A. Cable certifier
B. Cable tester
D. Protocol analyzer
A cable certifier is used to verify that a cable meets its specifications such as the bandwidth and frequency. For example, it can verify a CAT 5e cable meets specifications and supports speeds of 1000Mbps.
A company wants to secure its WAPs from unauthorized access. Which of the following is the MOST secure wireless encryption method?
A. SSID disable
WPA2 improves security of Wi-Fi connections by not allowing use of an algorithm called TKIP (Temporal Key Integrity Protocol) that has known security holes (limitations) in the original WPA implementation.
Which of the following will allow a technician to monitor all network traffic when connected to a mirror port?
A. VLAN tags
C. Packet sniffer
Mirror port just send the packet to the port which is selected to grab the packet of any destination port to capture that packets we need packet sniffer.
A customer wants to increase firewall security. Which of the following are common reasons for implementing port security on the firewall? (Select TWO).
A. Preventing dictionary attacks on user passwords
B. Reducing spam from outside email sources
C. Shielding servers from attacks on internal services
D. Blocking external probes for vulnerabilities
E. Directing DNS queries to the primary server
Port security is required because if we keep the ports unsecure then hackers can do port scanning and can compromise the internal secured network so we will have to shield servers to avoid attacks from outside and we need to block incoming scanning request coming from outside.
A user reports that some normally accessible external sites are not responding, but most other sites are responding normally. Which of the following is MOST likely the cause?
A. VLAN tag mismatch
B. Wrong subnet mask
C. Smurf attack
D. Faulty routing rule
This happens when the DNS server is able to resolve the URL but there can be a conflicting route pointing to somewhere else rather than to the correct device who is responsible for routing traffic to the internet.
The security measure used to reduce vulnerabilities for MOST network devices that require regular application and monitoring is:
A. patch management.
B. security limitations.
D. social engineering.
A patch is a piece of software designed to fix security vulnerabilities and other bugs, and improving the usability or performance.
A user wants to connect seven PCs together for a game night. Which of the following should the user install to help with this task?
A. Media convertor
They connect multiple PCs, printers, servers and other hardware. Switches allow you to send information, such as email, and access shared resources, including printers, in a smooth, efficient, and transparent manner.
Which of the following defines the amount of time a host retains a specific IP address before it is renewed or released?
A. DHCP lease
B. DNS suffix
C. Subnet mask
D. DHCP reservation
By default, each IP address assigned by a DHCP Server comes with a one-day lease, which is the amount of time that the address is valid.
Which of the following appliances creates and manages a large number of secure remote-access sessions, and also provides a high availability solution?
A. Media converter
B. Proxy server
C. VPN concentrator
D. Load balancer
The VPN Concentrator is used for Remote Access VPN’s that allows users to use an encrypted tunnel to securely access a corporate or other network via the Internet.
A customer wants to keep cost to a minimum and has only ordered a single static IP address from the ISP. Which of the following must be configured on the router to allow for all the computers to share the same public IP address?
Port Address Translation (PAT), is an extension to network address translation (NAT) that permits multiple devices on a local area network (LAN) to be mapped to a single public IP address. The goal of PAT is to conserve IP addresses.
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