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- Question
Routers operate at layer _____. LAN switches operate at layer ______. Ethernet hubs operate at layer _____. Word processing operates at layer _______.
Options- A. 3, 3, 1, 7
- B. 3, 2, 1, none
- C. 3, 2, 1, 7
- D. 3, 3, 2, none
- Correct Answer
- 3, 2, 1, none
ExplanationRouters operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1. Word processing applications communicate to the Application layer interface, but do not operate at layer 7, so the answer would be none.
- 1. What is the first thing that BGP checks to determine if a prefix is accessible? Discuss
- 2. What command will permit SMTP mail to only host 1.1.1.1?
Options- A. access-list 10 permit smtp host 1.1.1.1
- B. access-list 110 permit ip smtp host 1.1.1.1
- C. access-list 10 permit tcp any host 1.1.1.1 eq smtp
- D. access-list 110 permit tcp any host 1.1.1.1 eq smtp Discuss
- 3. The network with ip address 192.168.100.0/27 is to be used on a router. If ip subnet-zero is configured, which statement describe the resulting number of available subnets and hosts?
Options- A. 7 usable subnets, each with 32 host addresses
- B. 8 usable subnets, each with 30 host addresses
- C. 8 usable subnets, each with 27 host addresses
- D. 7 usable subnets, each with 24 host addresses Discuss
- 4. Mention different memories used in a CISCO router ? Discuss
- 5. What are the typical three different categories of VPNs? Discuss
- 6. Which layer is responsible for keeping the data from different applications seperate on the network? Discuss
- 7. A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20684570. Another route is from OSPF with a metric of 852. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table? A. the OSPF route B. the EIGRP route C. the RIPv2 route D. all three routes E. the OSPF and RIPv2 routes Discuss
- 8. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?
Options- A. Application
- B. Host-to-Host
- C. Internet
- D. Network Access Discuss
- 9. An administrator issues the command "ping 127.0.0.1" from the command line prompt on a PC host named PC1. If an ICMP reply is received, what does this confirm? A. The PC host PC1 has connectivity with a local host B. The PC host PC1 has connectivity with a Layer 3 device C. The PC host PC1 has a default gateway correctly configured D. The PC host PC1 has connectivity up to Layer 5 of the OSI model E. The PC host PC1 has the TCP/IP protocol stack correctly installed Discuss
- 10. Which of the following is an industry-wide standards suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer3 Network layer of the OSI model?
Options- A. HDLC
- B. xDSL
- C. VPN
- D. IPSec Discuss
CISCO Certification problems
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Correct Answer: BGP checks the NEXT_HOP attribute to determine if the NEXT_HOP is accessible or in the IP routing table
Correct Answer: access-list 110 permit tcp any host 1.1.1.1 eq smtp
Explanation:
when trying to find the best answer to an access - list question, always check the access - list bnumber and then the protocol. When filtering to an upper - layer protocol, you must use an extended list, numbers 100 - 199 and 2000 - 2699. Also, when you filter to the port of an upper - layer protocol, you must use either tcp or udp in the ACL protocol field. If it says ip in the protocol field, you cannot filoter on the port number of an upper - layer protocol. SMTP uses TCP
Correct Answer: 8 usable subnets, each with 30 host addresses
Explanation:
Because subnet zero is configured and we have a class C address (192.168.100.0) then the network portion will have 3 bits so 8 subnets will be available. The rest of the bits, 5, represent the available hosts, so 2^5=32, but only 30 are available, 0 ad 31 are network and broadcast respectively.
Correct Answer: Different Memories used in a CISCO router are as follows : NVRAM stores the startup configuration file DRAM stores the configuration file that is being executed Flash Memory ? stores the Cisco IOS
Correct Answer: The following are the different types of VPNs : PPTP ( Point to Point Tunnel protocol ) VPN : Most commonly used VPN PPTP is a method for implementing virtual private networks PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets Site-to-Site VPN : Site-to-site VPN is a type of VPN connection that is created between two separate locations Site-to-site VPN can be intranet based or extranet based Intranet-based site-to-site VPN is created between an organization's propriety networks, while extranet-based site-to-site VPN is used for connecting with external partner networks or an intranet L2TP ( Layer Two Tunneling Protoco) VPN : L2TP is an extension of the Point-to-Point Tunneling Protocol (PPTP) used by an Internet service provider (ISP) to enable the operation of a virtual private network over the Internet IPsec (Internet Protocol Security) : IPsec is a framework for a set of protocols for security at the network or packet processing layer of network communication SSL (Secure Sockets Layer) VPN : SSL is a form of VPN that can be used with a standard Web browser In contrast to the traditional Internet Protocol Security (IPsec) VPN, an SSL VPN does not require the installation of specialized client software on the end user's computer MPLS (Multiprotocol Label Switching) VPN : MPLS is a protocol for speeding up and shaping network traffic flows Hybrid VPN : A hybrid VPN combines Multiprotocol Label Switching (MPLS) and Internet protocol security (IPsec)-based VPNs
Correct Answer: The session layer creates sessions between different host's applications
Correct Answer: : B Explanation : This is one of those tricky questions just to test your knowledge of routing protocols and their administrative distance Let?s look at the AD of popular routing protocols below: Routing Protocol (Source) AdministrativeDistance(AD) Directly connected 0 Static Route 1 EIGRP 90 Summary Route(EIGRP) 5 OSPF 110 RIP 120 Fom the above table, you can see that EIGRP has the lowest AD from all of the above mentioned routing protocols So, the router will choose to use the routing protocol which has lowest Administrative Distance which in this case is B EIGRP
Correct Answer: Host-to-Host
Explanation:
The four layers of the TCP/IP stack (also called the DoD model) are Application/process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.
Correct Answer: : E
Correct Answer: IPSec
Explanation:
IPSec is an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer3 Network layer of the OSI model.
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