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SCNS Tactical Perimeter Defense
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The MAC Address, the IP Address and the IP Protocol ID
The IP Address, the IP Protocol ID and a Port number
The MAC Address and the IP Protocol ID
The MAC Address, the IP Protocol ID and a Port number
The Ethertype and a Port number
In an ICMP Message, what is the function of the first eight bits?
To define the source port number
To define the type
To define the destination port number
To define the IP Version
To define the upper layer protocol
You are introducing a co-worker to the security systems in place in your organization. Early in the discussion you begin talking about the network, and how it is implemented. You decide to run a packet capture to identify different aspects of network traffic for your co-worker. In the packet capture you are able to identify Protocol IDs. Which of the following is the IP Protocol ID for UDP?
Protocol ID 51
Protocol ID 21
Protocol ID 6
Protocol ID 17
Protocol ID 11 Answer: D QUESTION: 226
In order to properly manage the network traffic in your organization, you need a complete understanding of protocols and networking models. In regards to the 7-layer OSI model, what is the function of the Network Layer?
The Network layer allows two applications on different computers to establish, use, and end a session. This layer establishes dialog control between the two computers in a session, regulating which side transmits, plus when and how long it transmits.
The Network layer manages logical addresses. It also determines the route from the source to the destination computer and manages traffic problems, such as routing, and controlling the congestion of data packets.
The Network layer packages raw bits from the Physical (Layer 1) layer into frames (structured packets for data). Physical addressing (as opposed to network or logical addressing) defines how devices are addressed at the data link layer. This layer is responsible for transferring frames from one computer to another, without errors. After sending a frame, it waits for an acknowledgment from the receiving computer.
The Network layer transmits bits from one computer to another and regulates the transmission of a stream of bits over a physical medium. For example, this layer defines how the cable is attached to the network adapter and what transmission technique is used to send data over the cable.
The Network layer handles error recognition and recovery. It also repackages long messages, when necessary, into small packets for transmission and, at the receiving end, rebuilds packets into the original message. The corresponding Network layer at the receiving end also sends receipt acknowledgments.
You are using Network Monitor to capture some traffic for later analysis. When you do begin to look at your captured data, you examine the TCP traffic you captured. In a TCP Header, what is the function of the first sixteen bits?
To define the type
To define the IP Version
To define the destination port number
To define the upper layer protocol
To define the source port number
If you configure an access-list to block the following networks, what are you trying to protect against? Network 127.0.0.0/8, Network 0.0.0.0\0, Network 10.0.0.0\8, Network 172.16.0.0\16, and Network 168.0.0\16.
You are trying to protect against hijacking
You are trying to protect against spoofing
You are trying to protect against sniffing
You are trying to protect against splicing
You are trying to protect against capturing
You are a host in a network segment that has IP addresses in the range of 168.16.1~192.168.31.254. You need to create an access control list that will filter your segment of addresses. Which of the following is the wildcard mask that will be used to filter your network segment?
A. 10.0.16.1/20 B. 0.0.16.254
C. 255.240.0.0
D. 0.0.240.0
E. 0.0.15.255
The exhibit represents a simple routed network. Node 7 is a Windows NT 4.0 Workstation that establishes a TCP communication with Node 10, a Windows 2000 Professional host. The routers are Cisco 2500 series running IOS 11.2. While working at Node 10, you run a packet capture. When Node 10 receives a packet sent by Node 7, what will the capture reveal is the source MAC address?
Interface for Node 7
Interface E0 of Router A
Interfaces for both Nodes 7 and E0
Interface E0 of Router D
Interface for Node 10
During a network capture, using Wireshark, you capture some ICMP traffic for analysis. In an ICMP Message, what is the function of the first eight bits?
To define the source port number
To define the type
To define the destination port number
To define the IP Version
To define the upper layer protocol
A router has two active Ethernet interfaces. Interface E0 is connected to network 10.10.0.0/16 while Interface E1 is connected to network 10.1917.0.0/16. You are configuring access control lists
router(config)#access-list | 123 | deny | tcp | 10.11.0.0 | 0.0.255.255 | 10.10.0.0 | 0.0.255.255 | eq | 20 |
router(config)#access-list | 123 | deny | tcp | 10.11.0.0 | 0.0.255.255 | 10.10.0.0 | 0.0.255.255 | eq | 21 |
router(config)#access-list | 123 | deny | tcp | 10.10.0.0 | 0.0.255.255 | 10.11.0.0 | 0.0.255.255 | eq | 20 |
router(config)#access-list | 123 | deny | tcp | 10.10.0.0 | 0.0.255.255 | 10.11.0.0 | 0.0.255.255 | eq | 21 |
to manage specific access, which is disallowed on these segments. The configuration of the lists are as follows:
router(config)#access-list 123 permit tcp 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255
router(config)#Interface Ethernet 0
router(config-if)#ip access-group 123 in router(config-if)#Interface Ethernet 1 router(config- if)#ip access-group 123 in Based on the above list configuration, which of the following statements is true on the router?
All packets will be dropped
All packets that match the deny statements will be forwarded to the console port
All packets that do not match the deny statements will be allowed
An Access List cannot simultaneously be implemented upon two or more interfaces
We do not know if this is a standard or extended access list, therefore there is not enough information.
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