UL/FRI/UNI-RI/RKO/IP Primer - Teorija

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(Leto 2007)

Modul 1

How many layers do Open Systems Interconnection (OSI) and in TCP/IP models have?

7 and 5.

What is a unicast packet?

Type of packet destined to only one device.

Which two statements are true regarding functions of the network layer of OSI reference model? (Choose two.)

• Network layer handles the routing among nodes within a packet-switched network.
• Routing and forwarding are functions of the network layer, as well as logical addressing, error handling, congestion control and packet sequencing, quality of service (QoS), and security mechanisms.

Is it acceptable to have more than one static route configured?

Yes.

What are the three advantages gained by the hierarchical model of protocols? (Choose three.)

• Scalability and room for simple addition of new functionality.
• Makes it easier to understand and learn the model.
• Optimized traffic flow.

Which service is NOT an alternative for expensive dedicated leased line?

Fiber Distributed Data Interface (FDDI).

Which statement is true regarding the following route in the routing table: Network number: 10.1.1.0/24, next hop: 171.69.254.10, cost 100?

Router will send the IP packet with destination IP address 10.1.1.1 to the next-hop with IP address 171.69.254.10.

Which statement is true regarding distance vector routing protocols?

Distance vector routing protocols work with two pieces of information: the distance and the direction to a specific network.

Which two statements are true regarding (IP) routing? (Choose two.)

• Routing is a process of forwarding packets across networks from the source network towards the destination network using the best known path.
• Routing process consists of taking a received packet, retrieving the destination network from the packet destination IP address, consulting the routing table for the proper exit interface, and forwarding the packet to that interface.

Which two statements are true regarding UDP? (Choose two.)

• UDP does not support retransmission of lost UDP datagrams.
• UPD supports error-detection (CRC).

Is FTP a secure application? (Choose two.)

• Yes, if you use a secure version of the FTP (within SSH).
• No, because the username and password are sent to the server in clear text.

Which two statements are true regarding IP protocol? (Choose two.)

• The IP checksum function is supported by the IP protocol and detects the corrupted IP header part of IP packet. The checksum does not verify the data part, which is protected by the checksum at the transport layer protocol.
• IP protocol is unreliable protocol, which means that there are no guarantees that IP datagrams are successfully delivered to their destination network.

Which two statements are true regarding functions of the application layer of OSI reference model? (Choose two.)

• The application layer supports applications and end-user processes. Communication partners and QoS are identified, user authentication and privacy are considered, and any constraints on data syntax are identified.
• Representatives of application layer protocols are DNS, FTP, TFTP, BOOTP, SNMP, RLOGIN, SMTP, and TELNET.

Which two statements are NOT true regarding functions of the transport layer of OSI reference model? (Choose two.)

• The transport layer typically never runs on the end hosts.
• IP is a representative of a transport layer.

Which sentence is NOT true about simultaneous transport of multiple customer channels across the Service Provider (SP) network?

SPs use Frame Division Multiplexing (FDM), which allows many DS0 signals carried within a single DS1 channel by assigning different timeslots to each data channel.

What are the three benefits of a switched LAN? (Choose three.)

• Makes listening (sniffing) harder.
• Increases the bandwidth by establishing dedicated paths and provides better performance of a network.
• Eliminates collisions.

Which of the following protocols is connection-oriented?

TCP

Which statement is true regarding the FTP protocol?

FTP server opens an additional data flow connection (TCP session), which is usually sourced from the server’s port 20 to the port that the FTP client has specified.

What is a three-way handshake?

Three-way handshake is the process of establishing or terminating TCP connection.

Modul 2

Which statement is true regarding the Cyclic Redundancy Check (CRC)?

CRC is an error detection algorithm used to maximize the probability of detecting errors in messages that are thousands of bytes long using only small number of redundant bits.

Which statement is true regarding the Point-to-Point Protocol (PPP) encapsulation?

PPP frame format consists of the Start Flag, Address, Control, Protocol, Info, Check, and Stop Flag fields.

Which technology does NOT support transport of IP data across LAN?

IPX.

Which broadcast address corresponds to the IP subnet 10.129.0.0/17?

10.129.127.255

Which broadcast address corresponds to the IP subnet 10.16.0.0/12?

10.31.255.255

Which broadcast address corresponds to the IP subnet 10.0.3.128/25?

10.0.3.255

Which statement is true regarding EIGRP protocol?

EIGRP is appropriate for large networks and supports VLSM as well as discontiguous networks because it carries the network mask along with the route information in its update packets.

Which statement is true regarding EIGRP protocol?

EIGRP is a hybrid protocol with fast convergence.

Which statement is true regarding RIP protocol?

RIPv1 classfull behavior makes protocol unusable in variable-length subnetted networks.

Which statement is true regarding OSPF protocol?

OSPF is link state protocol, which means that every router in the area maintains a network topology database for its area and spans the shortest path tree to every known destination network.

Which statement is true when OSPF, EIGRP, and RIP running on the same router provide different routes for the same destination network?

RIP route would not be accepted into the routing table.

Which statement is true regarding RIP protocol?

RIP is relatively old open standard protocol, used for small and homogenous networks.

Which statement is true regarding the route redistribution between various routing protocols?

Problems with route redistribution are the different metric calculation methods and different convergence speeds among routing protocols.

3. modul

What does the output of the show users command present?

All the incoming router telnet sessions.

Which two of the listed Cisco router configuration commands limit the maximum number of simultaneous incoming telnet sessions to six? (Choose two.)

line vty 0 5
  login	 

line vty 6 11
  login	 

Which type of router memory stores the router (Cisco router 2600) startup configuration by default?

NVRAM.

Which of the following Cisco router configurations properly activates DCE side of serial connection using default encapsulation type for serial interface?

interface Serial 1
   clock rate 64000
   no shutdown	 

Which three statements are true regarding Challenge Handshake Authentication Protocol (CHAP)? (Choose three.)

• CHAP client uses the hostname to look up the appropriate secret, combines it with the challenge, and encrypts the string using a one-way hashing function.
• With CHAP, the authenticator (that is, the server) sends a randomly generated challenge string to CHAP client, along with its hostname.
• CHAP client hash value is returned to the CHAP server along with the client hostname. The server then performs the same computation, and acknowledges the client if the results match.

Which statement is true regarding Password Authentication Protocol (PAP) authentication?

PAP client sends a password and username to the authenticating peer as plain text. The peer validates the PAP request and sends back an acknowledgement or terminates the connection.

Which of the following statements is incorrect regarding classful and classless routing protocols?

Classful routing protocols allow the use of VLSM.

Which of the following Cisco router RIP configurations activates announcing of router attached subnets with addresses 20.0.0.0/8 and 10.0.0.0/8 on a router and activates the exchange (sending and receiving) of RIP updates across interfaces in subnets 10.0.0.0/8 and 20.0.0.0/8?

router rip
   network 10.0.0.0
   network 20.0.0.0	 

When network addressing results in discontiguous subnets, which two of the listed routing protocols could be used? (Choose two.)

• EIGRP
• RIPv2

Which of the following Cisco router configuration commands is used to list the operational state of Cisco router interfaces?

• show ip interface brief

Which Cisco router configuration command is used to configure the router hostname?

• hostname router-name command in global configuration mode

Which two of the listed network types does Frame Relay support? (Choose two.)

• Point-to-point.
• Broadcast.