HTML is used to create and format Web pages while HTTP is used to transmit the web pages over the network. Which of the following is used to check the route that an IP packet traversesfrom one host to another host? A. FTP B. Tracert C. ICMP D. Telne Which flag bit in TCP header must be set when a TCP entity wants to terminate a connection? A. FIN B. SYN C. RST D. ACK Transmission Control Protocol (TCP), has same Checksum controlling like A. TCP/IP B. ICMP C. UDP D. IP Which of the following networks can be connection-oriented? A, Telegraph networks B, Computer networks C, Telephone networks D, All of the above A protocol is a set of precise and unambiguous rules that governs A, How two or more communicating entities in a layer are to interact B, Messages that can be sent and received C, Actions that are to be taken when a certain event occurs D, All of the above D DNS is a domain-name-service that responds to queries of domain name to IP address or IP address to domain name. DNS uses services provided by A, TCP B, UDP C, HTTP D, None of the above B A network used to join the individual networks at different sites into one extended network is called A, PAN B, LAN C, SAN D, VPN D Upon receipt of a bad segment, UDP? A, It does flow control B, It does not do flow and error control C, It does error control D, Retransmission B Which of following protocol is HTTP built upon? A, IP B, TCP C, UDP D, SMTP 1. Which three layers of the OSI model make up the application layer of the TCP/IP model? (Choose three.) A. data link B. application C. presentation D. session E. transport F. Network 2. Which two layers of the OSI model specify protocols that are associatedwith Ethernet standards? (Choose two.) A. session layer B. physical layer C. transport layer D. data link layer 3. When you first log into the router, in which command mode do you enteras indicated by the > symbol? A. user EXEC mode B. privileged EXEC mode C. line configuration mode D. global configuration mode: A. user EXEC mode 4. Which Cisco IOS mode displays a prompt of Router#? A. privileged EXEC mode B. global configuration mode C. user EXEC mode setup mode 5. Which IP address type is intended for a specific host? A. broadcast B. multicast C. simulcast D. unicast: 6. Which type of packet goes to all hosts on a LAN? A. unicast B. multicast C. broadcast 7. What type of message is sent to a specific group of hosts? A. unicast B. dynamic C. multicast D. broadcast 8. Which IP configuration parameter provides the IP address of a network device that a computer would use to access the Internet? A. default gateway B. host IP address C. subnet mask D. DNS server Which network device is primarily used to translate a domain name to the associated IP address? A. router B. DNS server C. DHCP server D. default gateway Which device will not forward an ARP request to other hosts in the network? A. Switch B. Hub C. PDU D. Router Usually in the home network, only 1 device is used to connect the laptop, desktop to the Internet regardless the UTP cable is plug-in or not. This device must perform function belong to which of the following? A. Modem B. Router C. Switch D. Wireless access point E. All of the others What role does a router play on a network? A. forwarding Layer 2 broadcasts B. forwarding frames based on a MAC address C. selecting the path to destination networks D. connecting smaller networks into a single broadcast domain 9. What is used by a host to determine if another host is on the same network? A. ARP B. default gateway C. MAC address table D. subnet mask 10. Which layer has the same functionality in both the OSI and TCP/IP models? A. Application B. Presentation C. Session D. Transport: D. Transport 11. Which layer provides connections to hosts in a local Ethernet network? A. core layer B. network layer C. internet layer D. access layer: D. access layer 12. Which layered model was first used for internetwork communications? A. encapsulation B. IETF C. OSI Model D. Reference Model E. TCP/IP Model One can use repeaters, bridges and routers to interconnect two LANs. Which of the following approaches will make local traffic appear in both LANs? A. Repeater B. Routers C. Bridges D. All of the others Which application layer protocol is used to provide file-sharing and print services to Microsoft applications? A. DHCP B. SMB C. SMTP D. HTTP 13. Which protocol allows a user to type www.cisco.com instead of an IP address to access the web server? A. SNMP B. DNS C. HTTP D. FTP E. HTML This protocol is used by a client to send email to a mail server. A. HTTP B. POP C. IMAP D. SMTP Which two protocols are used in the process of sending and receivingemails? (Choose two.) A. FTP B. HTTP C. SMTP D. SSH E. POP What feature allows a device to obtain an address automatically? A. TCP/IP B. ping C. ip autoconfig D. DHCP Which command was used to view the IP address configuration of the PC? A. DHCP B. ip address C. ipconfig/ all D. network settings 14. What command is used to save the switch configuration? A. ipconfig/ all B. save config C. copy config D. copy running-config startup-config E. save config all 15. What command was used to verify the router configurations? A. verify config B. letmein C. show running-config D. view configuration copy running-config startup-config 16. What is the purpose of an IP address? A. It identifies the physical location of a data center. B. It identifies a location in memory from which a program runs. C. It identifies a return address for replying to email messages. D. It identifies the source and destination of data packets on a network. 17. What is the purpose of assigning an IP address to the VLAN1 interface on a Cisco Layer 2 switch? A. to create a new IP local network on the switch B. to enable the switch to route packets between networks C. to permit IP packets to be forwarded by the switch D. to enable remote access to the switch to manage it 18. What is the purpose of configuring a default gateway address on a host? A. to identify the device that allows local network computers to communicatewith devices on other networks B. to provide a permanent address to a computer C. to identify the logical address of a networked computer and uniquelyidentify it to the rest of the network D. to identify the network to which a computer is connected 19. What is the purpose of DHCP? A. gives clients the option to statically or dynamically assign itself an address B. provides a mechanism for the automatic assignment of addressing information for a client C. provides DNS addressing information to clients D. allows for the reuse of addresses on a network What is the purpose of NAT? A. provides a way to translate URLs to IP addresses B. finds the MAC address when the IP address is known C. maps and translates between public and private IP addresses D. creates a table of switch ports to MAC addresses Which type of attack attempts to overwhelm network links and devices with useless data? A. virus B. spyware C. brute force D. denial of service Which type of attack exploits human behavior to gain confidential information? A. virus B. social engineering C. denial of service D. spyware What type of program installs and gathers personal information, including password and account information, from a computer without permission or knowledge of the user? A. adware B. pop-ups C. spyware D. pop-unders Which function does NAT perform in a wireless router? A. NAT takes a source IP address and translates it to a default gateway address. B. NAT takes a local IP address and translates it to an internal source IP address. C. NAT takes a destination IP address and translates it to a global IP address. D. NAT takes an internal source IP address and translates it to a global IP address. 20. What is the purpose of the console port? A. provide in-band management of the switch B. send data between two host computers C. to connect the switch to the router D. provide out-of-band management for a router or switch: 21. What is the purpose of the core layer in the Cisco hierarchical networkdesign model? A. network access to end devices B. high-speed backbone switching C. aggregation point for smaller networks D. flow control between networks Which of following features are typically true for local area networks? A. Low round-trip delay B. Low error rate C. High speed D. All of the others In Carrier Sense Multiple Access with collision detection (CSMA-CD), how long will it take a collision to be detected and resolved? A. Round-trip propagation delay B. One propagation delay C. One frame transmission time D. None of the others For a 10Mbps Ethernet link, if the length of the packet is 32bits, the transmission delay is (in microseconds)? A. 320 B. 0.32 C. 3.2 D. 32 In which order do the DHCP messages occur when a client and server are negotiating address configuration? Discover – offer – request - pack Using a systematic troubleshooting approach, a help desk technician suspects a problem at Layer 3 of the OSI model. In gathering information, which two questions are associated with Layer 3? (Choose two.) A. From the PC, is the default gateway reachable using the ping command? B. Does a browser connection to www.cisco.com work? C. Is the network cable plugged in? D. Is the PC configured for DHCP? E. Is there a link light on the network card? In a virtual-circuit packet network, routing is determined during connection set-up True False Following the above question, in the third algorithm iteration, which nodes will update their entries and inform their neighbors? 3 4 6 All of the above Consider the network as shown in the figure. We use the Bellman-Ford algorithm to find the set of shortest paths from all nodes to the destination node 2. Each node maintains an entry (n, cost) about the next node along the current shortest path and the current minimum cost from the node to the destination. Initially, each node has entry (-1, infinity). In the first algorithm iteration, which nodes will update their entries and inform their neighbors? 1 4 5 All of the above What are possible metrics for routing? Hop count Delay Bandwidth All of the above Six stations (S1-S6) are connected to an extended LAN through transparent bridges (B1 and B2), as shown in the following figure. Initially, the forwarding tables are empty. Both bridges use backward learning to build their tables. Suppose station S2 transmits a frame to S1. Which of following statements is correct? The frame will reach bridge B2 only None of the above The frame will reach both bridges B1 and B2 The frame will reach bridge B1 only Consider a three hop network from the source to the destination. Let m be the message transmission time at each hop. Let n be the propagation delay of each hop. Assume there is no queueing delay and processing time at each hop. Based on store-and-forward, what is the total time for three packets to be transmitted to the destination by packet pipelining? 3m + 3n 5m + 3n 9m + 9n None of the above Which of the following features are true for asynchronous transfer mode (ATM)? It supports quality of service All of the above It is connection-oriented It only supports fixed-length packets Consider the network as shown in the figure. We use the Dijkstra's algorithm to find the set of shortest paths from all nodes to the destination node 4. In Dijkstra's algorithm, each iteration the next closet node is added to the set with the root node. At the first iteration, which node will be added to the set N? 1 / 1 point 5 1 3 2 Question 3 Following the question above, at the second iteration, which node will be added to the set N? 1 / 1 point 6 5 3 1 Question 4 Following the question above, at the third iteration, which node will be added to the set N? 1 / 1 point 5 1 3 6 Following the question above, at the fourth iteration, which node will be added to the set N? 3 1 6 5 What are the limitations of RIP protocol Limited metric use Slow convergence Fixed number of hops Update message overhead In Open Shortest Path First (OSPF), which of the following statements are correct 1 / 1 point Allows routers to build shortest path tree with router as root OSPF typically converges slower than RIp when there is a failure in the network Each router builds an identical link-state database Enables each router to learn complete network topology Which of the following is a type of router defined in OSPF 1 / 1 point Internal router Area border router Backbone router All of the above In a distance vector routing, if a link fails All routers immediately update their link database and recalculate their shortest path Neighboring routers exchange routing tables that may use failed links Routers set link distance to infinity and floods the network with an update packet All of the above Which of the following statements is wrong about fair queuing? 1 / 1 point Fair queueing is a packet-level traffic management Fair queueing attempts to provide equal-size buffers to flows Fair queueing attempts to provide equitable access to transmission bandwidth All of the above To guarantee network performance during the lifetime of admitted flows, open-loop control relies on the following mechanism except: 1 / 1 point Admission control Traffic policing Traffic shaping Head-of-Line queueing Which of following statements about leaky bucket is wrong? Leaky bucket is a flow-level traffic management mechanism In the leaky bucket, the packet output rate can be variable In the leaky bucket, the packet output rate is always constant In leaky bucket, when the bucket is full, the new arriving packets may be discarded Upon which of the following condition is token bucket and leaky bucket the same? A. Leaky bucket size is zero B. Token bucket size is infinite C. Leaky bucket size is infinite D. Token bucket size is zero In Head of Line (HOL) priority queueing, which of the following statement is true for this approach A. High priority queue has higher waiting time B. Buffers can be dimensioned for different loss probabilities C. High priority queue has lower waiting time D. High priority queue services until empty In buffer management, which of the following statement is correct for Random Early Detection (RED) technique A. Improves performance of cooperating TCP sources B. Reduce loss probability of misbehaving sources C. Packets produced by TCP will reduce input rate in response to network congestion D. Early drop causes some sources to reduce rate before others, causing gradual reduction in in aggregate input rate Which of the following packet header length cannot be used in an IPv4 packet header? A. 20 Bytes B. 30 Bytes C. 60 Bytes D. 64 Bytes What is the dotted notation of an IP address of 10000000 10000111 01000100 00000101 ? A. 128.135.65.5 B. 128.135.65.5 C. 128.135.68.5 D. 128.133.68.5 Given a network address 128.100.0.0, what is its network class type? A. Class A B. Class B C. Class C D. None of the above Based on 1.1.1.0/24, the IP address would be: A. Class A B. Class B C. Class C D. Class D Which class of IP addresses does CIDR performs aggregation on? A. Class C B. Class D C. Class B D. Class A When calculating usable hosts per subnet, the following formula is used 2^bits - 2. For what reason is two subtracted? (choose two) A. Broadcast B. Network C. Unicast D. Multicast AB How many hosts can be addressed on 10.0.0.0/16? A. 16 B. 254 C. 65536 D. 65534 D Which of the following is a valid IP host address given the network ID of 191.254.0.0 while using 11 bits for subnetting? A. 191.254.1.29 B. 191.254.0.32 C. 191.54.1.64 D. 191.254.0.96 A DISCO Corporation has been assigned the Class B network address 165.87.0.0. DISCO needs to divide the network into eight subnets. What subnet mask should be applied to the network to provide the most hosts per subnet? A. 255.255.240.0 B. 255.255.248.0 C. 255.255.192.0 D. 255.255.224.0 In NAT operations, which of the following statements are correct A. NAT maps each private IP address and port number into shared global IP address and available port number B. Hosts inside private networks generate packets with private IP address and TCP/UDP port numbers C. Translation table allows packets to be routed unambiguously D. Translation table allows packets to be routed ambiguously ABC Pv6 allows fragmentation at A. Source only B. Intermediate routers only C. Both source and intermediate routers D. None of the above A IPv6 has a much larger space of A. 2^8 B. 2^16 C. 2^32 D. 2^128 Which of these statements are true of IPv6 representation A. The first 64 bits represent the dynamically created interface ID. B. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory C. A single interface may be assigned multiple IPv6 addresses of any type D. Every IPv6 interface contains at least one loopback address In TCP/IP protocol, what is the decimal range of the first octet of class Aaddress? A. 0 –126 B. 0– 127 C. 1–126 D. 1–127
