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Which of the following provides secure access to a network device?
Secure Shell(SSH) is a cryptographic network protocol for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers that connects, via a secure channel over an insecure network, a server and a client (running SSH server and SSH client programs, respectively).
Which of the following uses distance vector algorithms to determine the BEST network route to a destination address?
Here the termdistance vectorrefers to the fact that the protocol manipulatesvectors (arrays) of distances to other nodes in the network
Which of the following uses classless subnet masks across a network?
Classless Inter-Domain Routing is based onvariable-length subnet masking(VLSM), which allows a network to be divided into variously sized subnets, providing the opportunity to size a network more appropriately for local needs and also CIDR allows an address or routing prefix to be written with a suffix indicating the number of bits of the prefix, such as 192.168.2.0/24.
Enterprise IP routing policy is MOST clearly depicted in which of the following configuration management documents?
A. Logical network diagrams
B. Physical network diagrams
C. Wiring schematics
D. Group security role assignments
A logical network diagram illustrates the network architecture of a group of interconnected computers and other devices, such as printers, modems, switches, routers, and even mobile devices. These electronic components form the physical network that provides local area network (LAN) and wide area network (WAN) access to users. Once you know the layout and you have an idea about the packet flow then your job becomes easy and you can create an action plan to go for the implementation.
While preparing to replace an old CAT3 cable with a CAT6 cable to implement VoIP, a facilities employee mistakenly disconnects the entire patch panel, including valid wiring to live workstations. Which of the following should an administrator use in order to connect those ports FIRST?
D. Cable tester
Toner-connects to any voice, data, or video cable to detect open/short circuits, continuity, AC/DC voltage* and dial tone* all while protecting up to 52 volt.
Which of the following methods would be implemented to correct a network slowdown caused by excessive video streaming?
A. Traffic shaping
B. Proxy server
C. VPN concentrator
D. High availability
As traffic shaping will prioritize the video packets over another packets and then video packets will travel fast on bandwidth.
While working on a PC, a technician notices 0.0.0.0 in the routing table. Which of the following does this indicate?
A. It is the default route.
B. This is the address for the DHCP server.
C. The PC has not been assigned an IP address.
D. The firewall is down.
The address 0.0.0.0 generally means “any address”. If a packet destination doesn’t match an individual address in the table, it must match a 0.0.0.0 gateway address. In other words, default gateway is always pointed by 0.0.0.0
Users inform an administrator that the network is slow. The administrator notices the bulk of the traffic is SIP and RTP traffic. Which of the following could the administrator do to help BEST alleviate the traffic congestion for the users?
A. Create an ACL on the switches and routers that are dropping SIP and RTP packets.
B. Create a QoS policy prioritizing users over RTP and SIP traffic.
C. Create another VLAN for SIP and RTP traffic.
D. Create a rule to throttle SIP and RTP to 10Kbps or less.
As if we will create a vlan for sip and rtp traffic only this traffic will flow from the ports then.
If a NIC does not have a link light, there is a failure at which of the following OSI layers?
C. Data link
The NIC does not have light refers to a situation that there could be a fault in the LAN cable or the ports are down and all of these fall under the physical layer. To make it simple, it falls in physical layer because blinking lights refers to the physical connectivity.
Which of the following is the control when observing network bandwidth patterns over time?
A. Network log
C. Flow data
D. Interface statistics
To successfully baseline a network it is important to consider two functions; performance at protocol level and performance at application level. There are many significant metrics to consider at the protocol level, but only a few which are critical. The most important is bandwidthutilizationcompared with bandwidth availability. The most likely cause of poor network performance is insufficient bandwidth. Trending bandwidthutilizationallows you torecognizeproblem areas, provide enough bandwidth to reach performance objectives, and predict future capacity requirements. Changes in bandwidthutilizationpatterns also provide a clear indication of network usage alterations, such as a change in end-userbehavior, or theunauthorizedaddition of an application.
Which of the following technologies is used on cellular networks?
CDMA is an example of multiple access, which is where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this to be achieved without undue interference between the users CDMA employs spread-spectrum technology and a special coding scheme
Which of the following technologies allows multiple staff members to connect back to a centralized office?
A. Peer to Peer
VPNenables a computer to send and receive data across shared or public networks as if it were directly connected to the private network, while benefiting from the functionality, security and management policies of the private network. This is done by establishing a virtual point-to-pointconnection through the use of dedicated connections, encryption, or a combination of the two.
Which of the following is the MOST secure way to prevent malicious changes to a firewall?
A. SNMPv2 access only
B. TELNET access only
C. SSH access only
D. Console access only
Which of the following allows a malicious attacker to view network traffic if the attacker is on the same network segment as Joe, an administrator?
A. DoS attack
B. Man-in-the-middle attack
C. Smurf attack
D. Xmas attack
An attack where a user gets between the sender and receiver of information and sniffs any information being sent. In some cases, users may be sending unencrypted data, which means theman-in-the-middle(MITM) can obtain any unencrypted information. In other cases, a user may be able to obtain information from the attack, but have to unencrypt the information before it can be read.
Which of the following OSI layers allows users to access network services such as file sharing?
A. Layer 1
B. Layer 3
C. Layer 4
D. Layer 7
Basically File Transfer protocol(FTP) is responsible for file transfer which lies under Application layer (Layer 7) of OSI layers.
Which of the following can function in an unsecure mode?
SNMPv3 makes no changes to the protocol aside from the addition of cryptographic security, it looks much different due to new textual conventions, concepts, and terminology.SNMPv3 primarily added security and remote configuration enhancements to SNMP
Which of the following is used to register and resolve IP addresses with their plain language equivalents?
A. Proxy server
B. DNS server
C. Brouter equipment
D. DHCP server
DNS server translate (resolution) the human-memorable domain names and hostnames into the corresponding numeric Internet Protocol (IP) addresses.
An administrator determines there are an excessive number of packets being sent to a web server repeatedly by a small number of external IP addresses. This is an example of which of the following attacks?
DDoS attack,a type of attack on a network that is designed to bring the network to its knees by flooding it with useless traffic. Many DoS attacks, such as thePing of DeathandTeardropattacks, exploit limitations in the TCP/IP protocols
Which of the following features will a firewall MOST likely use to detect and prevent malicious traffic on the network?
A. Zone filtering
B. Signature identification
C. Port identification
D. Port scanner
Signature-based detection really is more along the lines of intrusion detection than firewalls. However, many personal firewalls and some corporate firewalls contain this functionality. Essentially, the system can be configured to look for specific patterns, known to be malicious, and block the traffic
Which of the following protocols is MOST commonly associated with VoIP?
The Session Initiation Protocol (SIP) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks.
Stateful packet inspection is a security technology used by which of the following devices?
A. Unmanaged switch
B. Hardware firewall
With Stateful Packet Inspection (SPI), every time a packet is sent out of the computer, the firewall keeps track of it. When a packet comes back to the firewall, the firewall can tell whether or not the in-bound packet is a reply to the packet that was sent out.This way, the firewall can handle most network traffic safely without a complex configuration of firewall rules.
Which of the following commands will provide an administrator with the number of hops a packet takes from host to host?
In computing, traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop indicates the total time spent to establish the connection.
Which of the following is needed when using WPA2-Enterprise wireless encryption?
The WPA2 standard supports two different authentication mechanisms: one using standard RADIUS servers and the other with a shared key, similar to how WEP works.
Which of the following technologies is used to connect public networks using POTS lines?
The PSTN consists of telephone lines, fiber optic cables, microwave transmission links, cellular networks, communications satellites, and undersea telephone cables, all interconnected by switching centers, thus allowing any telephone in the world to communicate with any other
An administrator would like to inspect all traffic flowing over the SMTP protocol on a given network. Which of the following tools would accomplish this? (Select TWO).
A. Packet sniffer
C. Port mirroring
E. Port scanner
(IPS), also known asintrusion detection and prevention systems(IDPS), are network security appliances that monitor network and/or system activities for malicious activity. The main functions of intrusion prevention systems are to identify malicious activity, log information about this activity, attempt to block/stop it, and report it.
And we use packet sniffer to detect the types of packet.
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