21⟩ What is Authentication Token?
A portable device used for authenticating a user. Authentication tokens operate by challenge/response, time-based code sequences, or other techniques. This may include paper-based lists of one-time passwords.
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45 Firewall Questions And Answers
22⟩ What is Tunneling Router?
A router or system capable of routing traffic by encrypting it and encapsulating it for transmission across an untrusted network, for eventual de-encapsulation and decryption.
23⟩ Explain What is Application-Layer Firewall?
A firewall system in which service is provided by processes that maintain complete TCP connection state and sequencing. Application layer firewalls often re-address traffic so that outgoing traffic appears to have originated from the firewall, rather than the internal host.
24⟩ Explain employee assistance program (EAP) application is now required to be deployed?
Your companys employee assistance program (EAP) application is now required to be deployed on the Web. The following are characteristics and requirements of the new system: The UI is an off-the-shelf, unsigned terminal-emulator applet. The applet communicates with a terminal server using a proprietary TCP/IP-based protocol. The terminal server sits behind the corporate firewall and listens on port 10001. The only configurable items for the applet
25⟩ What is Screened Host?
A host on a network behind a screening router. The degree to which a screened host may be accessed depends on the screening rules in the router.
26⟩ Explain Can traceout command work across the firewall? If No then why? If Yes then why?
Traceroute is based on ICMP type 30 under Windows and UDP under *NIX; traceroute pacjets that would hit the firewall should be dropped similarly any echo replay coming from inside the firewall should be restricted outbound. The answer: traceroute can ...
27⟩ In what way firewall provides security and how far it works to different intruders and attackers? and what are all the disadvantages in the firewalls security access?
A firewall block everything.it depends on you when configuring your network wat traffic to let in and wat traffic to block.its acts as a gaurd to u r network.its like a screening of a person on a airport...its does a deep pack inspection.
28⟩ What is IP Splicing/Hijacking?
An attack whereby an active, established, session is intercepted and co-opted by the attacker. IP Splicing attacks may occur after an authentication has been made, permitting the attacker to assume the role of an already authorized user. Primary protections against IP Splicing rely on encryption at the session or network layer.
29⟩ What is Screened Subnet?
A subnet behind a screening router. The degree to which the subnet may be accessed depends on the screening rules in the router.
30⟩ What is Virtual Network Perimeter?
A network that appears to be a single protected network behind firewalls, which actually encompasses encrypted virtual links over untrusted networks.
31⟩ What is Data Driven Attack?
A form of attack in which the attack is encoded in innocuous-seeming data which is executed by a user or other software to implement an attack. In the case of firewalls, a data driven attack is a concern since it may get through the firewall in data form and launch an attack against a system behind the firewall.
32⟩ What is Dual Homed Gateway?
A dual homed gateway is a system that has two or more network interfaces, each of which is connected to a different network. In firewall configurations, a dual homed gateway usually acts to block or filter some or all of the traffic trying to pass between the networks.
33⟩ What is Trojan Horse?
A software entity that appears to do something normal but which, in fact, contains a trapdoor or attack program.
the software which protects the computer from getting virus which totally affects the total working of the computer
34⟩ Explain If JumpStart clients are on a different subnet to the DHCP server, what must be configured to enable If JumpStart clients are on a different subnet to the DHCP server, what must be configured to enable them to communicate with the DHCP server?
I think we can configure helper address on the subnet vlan.
Than client can communicate with the DHCP server.
35⟩ What is Virus?
A replicating code segment that attaches itself to a program or data file. Viruses might or might not not contain attack programs or trapdoors.
Viruses is hidden software
program.
36⟩ Explain the difference between router ACLs and Firewall ACLs?
Fundamental purpose: 1)Routers are designed to route traffic, not stop it.2)Firewalls are designed to examine and accept/reject traffic. But the both ACL are do the same job. Depending upon our requirments we do our ACL configuration on it. ...
37⟩ What is Perimeter-based Security?
The technique of securing a network by controlling access to all entry and exit points of the network.
38⟩ What is Proxy?
A software agent that acts on behalf of a user. Typical proxies accept a connection from a user, make a decision as to whether or not the user or client IP address is permitted to use the proxy, perhaps does additional authentication, and then completes a connection on behalf of the user to a remote destination.
39⟩ What is Intrusion Detection?
Detection of break-ins or break-in attempts either manually or via software expert systems that operate on logs or other information available on the network.
40⟩ What is Logging?
The process of storing information about events that occurred on the firewall or network.
