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Network Security FAQ Virtual Private Networks

Network Security FAQ Virtual Private Networks

ConfigRouter
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Network Security FAQ Virtual Private Networks

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  1. www.ConfigRouter.com Network​​Security​​FAQ:​​Virtual​​Private​​Networks Q1.​​Name​​three​​types​​of​​VPN​​solutions. Answer:​​Three​​types​​of​​VPN​​solutions​​include​​remote​​access,​​site-to-site,​​and​​firewall-based. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q2.​​What​​are​​the​​four​​major​​functions​​of​​IPSec? Answer:​​The​​four​​major​​functions​​of​​IPSec​​are​​confidentiality,​​data​​integrity,​​origin authentication,​​and​​antireplay​​protection. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q3.​​Describe​​the​​two​​HMAC​​algorithms​​that​​are​​commonly​​used​​today​​to​​provide​​data​​integrity. Answer:​​The​​two​​HMAC​​algorithms​​that​​are​​commonly​​used​​today​​to​​provide​​data​​integrity​​are as​​follows: HMAC-MD5​​This​​protocol​​uses​​a​​128-bit​​shared​​key.​​The​​key​​and​​the​​message​​combine​​to form​​a​​128-bit​​hash. HMAC-SHA-1​​This​​protocol​​uses​​a​​160-bit​​shared​​key.​​The​​length​​of​​the​​hash​​is​​160​​bits,​​so this​​protocol​​is​​considered​​stronger​​because​​of​​the​​longer​​key. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q4.​​What​​are​​the​​three​​peer​​authentication​​methods​​used​​in​​IPSec? Answer:​​Three​​peer​​authentication​​methods​​used​​in​​IPSec​​are​​as​​follows: Preshared​​keys​​A​​secret​​key​​is​​entered​​into​​each​​peer​​manually. RSA​​signatures​​This​​uses​​the​​exchange​​of​​digital​​certificates​​to​​authenticate​​the​​peers. RSA​​encryption​​nonces​​Nonces​​(a​​random​​number​​generated​​by​​the​​peers)​​are​​encrypted​​and then​​exchanged​​between​​peers.​​The​​two​​nonces​​are​​used​​during​​the​​peer​​authentication process. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ https://configrouternotes.blogspot.in  https://configrouter.tumblr.com/  https://in.pinterest.com/phaniconfig/ccna-online-training/  https://configrouternotes.wordpress.com/  https://twitter.com/PhaniConfig  https://trello.com/configrouter 

  2. www.ConfigRouter.com http://flip.it/y5znjX  https://www.reddit.com/user/phani_config/  https://www.scoop.it/t/ccna-exam-answers  http://feeds.feedburner.com/ConfigRouter    CCNA​ ​200-125​ ​Dump​ ​With​ ​Questions​ ​​ ​and​ ​Answers​ ​with​ ​Explanation  CCNA​ ​NetAcad​ ​Training  CCNA​ ​RS​ ​Training  CCNA​ ​Cyber​ ​Ops​ ​Training  CCNA​ ​Data​ ​Center​ ​Training  CCNA​ ​Security​ ​Training https://www.youtube.com/c/CiscoNetworkingVideos Nexus​​OS​​Basics​​and​​Fundamentals​​Complete​​Video​​Course https://www.youtube.com/watch?v=pwn0sT4pOEo&list=PL9UP_4zHScPw49YXOCkK9UFRbPP S55RD2 CCNA​​Cyber​​Ops​​SECFND​​210-250​​Complete​​Video​​Course https://www.youtube.com/watch?v=eT88kco4u5M&list=PL9UP_4zHScPxTqWXRTbTHOUZ4IH BfItpZ CCNA​​Wireless​​200-355​​Complete​​Video​​Course https://www.youtube.com/watch?v=yNnGavnlTZ0&list=PL9UP_4zHScPweZMvKm2mhucuF0X- kO5jV CCNA​​Cloud​​CLDADM​​210-455​​Complete​​Video​​Course https://www.youtube.com/watch?v=GjD27VyOYEQ&list=PL9UP_4zHScPz35gaincmzptwnH1cB M8Oj CCNA​​Data​​Center​​DCICT​​200-155​​Complete​​Video​​Course https://www.youtube.com/watch?v=QMe8ZgviyZ4&list=PL9UP_4zHScPwrrIVgNHW8c2weI-pIgF DL CCNA​​Data​​Center​​DCICN​​200-150​​Complete​​Video​​Course https://www.youtube.com/watch?v=VAJv3C4BgjE&list=PL9UP_4zHScPyjupWBcyODSaJjlR7Se Ik- CCNA​​Cloud​​CLDFND​​200-451​​Complete​​Video​​Course https://www.youtube.com/watch?v=C3SdnXLAA7M&list=PL9UP_4zHScPy8PX3z55iFF0rW66n- 1PDf

  3. www.ConfigRouter.com Q5.​​There​​are​​two​​main​​IPSec​​framework​​protocols​​available.​​State​​their​​names​​and​​give​​a​​brief explanation​​of​​what​​they​​do. Answer:​​The​​two​​main​​IPSec​​framework​​protocols​​are​​as​​follows: AH​​AH​​is​​the​​protocol​​to​​use​​when​​confidentiality​​is​​not​​required.​​It​​provides​​data​​authentication and​​integrity​​for​​IP​​packets​​between​​two​​systems.​​It​​verifies​​that​​the​​origin​​of​​the​​packet​​is correct​​and​​that​​the​​packet​​is​​not​​modified​​during​​transport.​​It​​does​​not​​encrypt​​the​​data​​packet. All​​text​​is​​transported​​in​​clear​​text. ESP​​This​​protocol​​can​​be​​used​​to​​provide​​encryption​​and​​authentication.​​It​​provides confidentiality​​by​​performing​​encryption​​at​​the​​IP​​packet​​layer.​​ESP​​provides​​authentication​​for the​​IP​​packet​​and​​the​​ESP​​header.​​As​​with​​AH,​​ESP​​verifies​​three​​things:​​that​​the​​packet originated​​from​​where​​it​​declares​​it​​did,​​that​​the​​packet​​is​​what​​it​​says​​it​​is,​​and​​that​​the​​packet has​​not​​been​​modified​​during​​transport. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q6.​​Both​​ESP​​and​​AH​​can​​be​​applied​​to​​IP​​packets​​in​​two​​different​​ways.​​List​​those​​two​​modes and​​explain​​the​​difference​​between​​them. Answer:​​The​​two​​modes​​are​​as​​follows: Transport​​mode​​This​​mode​​is​​primarily​​used​​for​​end-to-end​​connections​​between​​hosts​​or devices​​acting​​as​​hosts.​​Transport​​mode​​protects​​the​​payload​​of​​the​​packet​​but​​leaves​​the original​​IP​​address​​readable.​​This​​address​​is​​used​​to​​route​​packets​​through​​the​​Internet. Transport​​mode​​provides​​security​​to​​the​​higher​​layer​​protocols​​only. Tunnel​​mode​​This​​mode​​is​​used​​between​​gateways​​such​​as​​routers,​​PIX​​Firewalls,​​or​​VPN concentrators.​​Tunnel​​mode​​is​​used​​when​​the​​final​​destination​​is​​not​​a​​host​​but​​a​​VPN​​gateway. In​​this​​mode,​​instead​​of​​shifting​​the​​original​​IP​​header​​to​​the​​left​​and​​then​​inserting​​the​​IPSec header,​​the​​original​​header​​is​​copied​​and​​shifted​​to​​the​​left​​to​​form​​a​​new​​IP​​header.​​The​​IPSec header​​is​​then​​placed​​between​​the​​new​​and​​the​​original​​IP​​headers.​​The​​original​​datagram​​is​​left intact. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q7.​​List​​the​​functions​​for​​which​​IKE​​Phase​​1​​is​​responsible. Answer:​​IKE​​Phase​​1​​is​​responsible​​for​​the​​following​​functions: Authenticating​​the​​IPSec​​peers Negotiating​​an​​IKE​​security​​association​​between​​the​​peers Initiating​​a​​secure​​tunnel​​for​​IPSec​​using​​the​​Internet​​Security​​Association​​and​​Key Management​​Protocol​​(ISAKMP) http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/

  4. www.ConfigRouter.com Q8.​​List​​the​​functions​​for​​which​​IKE​​Phase​​2​​is​​responsible. Answer:​​IKE​​Phase​​2​​is​​responsible​​for​​the​​following​​functions: Negotiating​​the​​set​​of​​security​​parameters​​for​​the​​tunnel Creating​​the​​IPSec​​tunnel http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q9.​​What​​steps​​should​​be​​completed​​before​​configuring​​a​​device​​to​​use​​IPSec? Answer:​​Before​​configuring​​a​​device​​to​​use​​IPSec,​​you​​should​​complete​​the​​following​​steps: Step​​1.​​Establish​​an​​IKE​​policy​​This​​policy​​must​​be​​identical​​on​​both​​sides​​of​​the​​VPN. Step​​2.​​Establish​​an​​IPSec​​policy​​Only​​certain​​traffic​​has​​to​​go​​through​​the​​IPSec​​tunnel.​​Of course,​​you​​can​​decide​​to​​send​​all​​traffic​​between​​peers​​through​​that​​tunnel,​​but​​there​​is​​a significant​​performance​​penalty​​when​​using​​IPSec.​​It​​is​​better​​to​​be​​selective.​​As​​in​​step​​1,​​both peers​​need​​to​​have​​the​​same​​IPSec​​policies. Step​​3.​​Examine​​the​​existing​​configuration​​Check​​your​​devices​​to​​avoid​​conflicts​​with​​existing settings​​on​​one​​of​​the​​devices. Step​​4.​​Test​​the​​network​​before​​IPSec​​Check​​whether​​you​​can​​ping​​the​​peers​​that​​are​​going​​to participate​​in​​IPSec.​​If​​you​​cannot​​ping​​them,​​you​​must​​fix​​this​​before​​you​​can​​configure​​IPSec. Step​​5.​​Permit​​IPSec​​ports​​and​​protocols​​If​​there​​are​​access​​lists​​enabled​​on​​the​​devices​​along the​​path​​of​​the​​VPN,​​make​​sure​​that​​those​​devices​​permit​​the​​IPSec​​traffic. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/ Q10.​​Describe​​briefly​​how​​the​​IPSec​​process​​works. Answer:​​The​​following​​steps​​outline​​how​​an​​IPSec​​process​​works: Step​​1.​​Interesting​​traffic​​initiates​​the​​setup​​of​​an​​IPSec​​tunnel. Step​​2.​​IKE​​Phase​​1​​authenticates​​peers​​and​​establishes​​a​​secure​​tunnel​​for​​IPSec​​negotiation. Step​​3.​​IKE​​Phase​​2​​completes​​the​​IPSec​​negotiation​​and​​establishes​​the​​tunnel. Step​​4.​​Secure​​VPN​​communication​​can​​occur. Step​​5.​​When​​there​​is​​no​​traffic​​to​​use​​IPSec,​​the​​tunnel​​is​​torn​​down,​​either​​explicitly​​or because​​the​​SA​​timed​​out. http://www.configrouter.com/network-security-faq-virtual-private-networks-7479/

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