Cisco 200-120 Online Practice Questions and Exam Preparation

Cisco 200-120 Online Questions & Answers

• Question 301:

  Refer to the exhibit.

  

  All switch ports are assigned to the correct VLANs, but none of the hosts connected to SwitchA can communicate with hosts in the same VLAN connected to SwitchB. Based on the output shown, what is the most likely problem?

  A. The access link needs to be configured in multiple VLANs.
  B. The link between the switches is configured in the wrong VLAN.
  C. The link between the switches needs to be configured as a trunk.
  D. VTP is not configured to carry VLAN information between the switches.
  E. Switch IP addresses must be configured in order for traffic to be forwarded between the switches.
  C. The link between the switches needs to be configured as a trunk.

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  In order to pass traffic from VLANs on different switches, the connections between the switches must be configured as trunk ports.

• Question 302:

  Refer to the exhibit.

  

  Which three statements correctly describe Network Device A? (Choose three.)

  A. With a network wide mask of 255.255.255.128, each interface does not require an IP address.
  B. With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.
  C. With a network wide mask of 255.255.255.0, must be a Layer 2 device for the PCs to communicate with each other.
  D. With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.
  E. With a network wide mask of 255.255.254.0, each interface does not require an IP address.
  B. With a network wide mask of 255.255.255.128, each interface does require an IP address on a unique IP subnet.
  D. With a network wide mask of 255.255.255.0, must be a Layer 3 device for the PCs to communicate with each other.
  E. With a network wide mask of 255.255.254.0, each interface does not require an IP address.

  ---

  If Subnet Mask is 255.255.255.128 the hosts vary from x.x.x.0 - x.x.x.127 and x.x.x.128- x.x.x.255, so the IP Addresses of 2 hosts fall in different subnets so each interface needs an IP an address so that they can communicate each other.

  If Subnet Mask is 255.255.255.0 the 2 specified hosts fall in different subnets so they need a Layer 3 device to communicate.

  If Subnet Mask is 255.255.254.0 the 2 specified hosts are in same subnet so are in network address and can be accommodated in same Layer 2 domain and can communicate with each other directly using the Layer 2 address.

• Question 303:

  Which command can you execute to set the user inactivity timer to 10 seconds?

  A. SW1(config-line)#exec-timeout 0 10
  B. SW1(config-line)#exec-timeout 10
  C. SW1(config-line)#absolute-timeout 0 10
  D. SW1(config-line)#absolute-timeout 10
  A. SW1(config-line)#exec-timeout 0 10

• Question 304:

  How is an EUI-64 format interface ID created from a 48-bit MAC address?

  A. by appending 0xFF to the MAC address
  B. by prefixing the MAC address with 0xFFEE
  C. by prefixing the MAC address with 0xFF and appending 0xFF to it
  D. by inserting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address
  E. by prefixing the MAC address with 0xF and inserting 0xF after each of its first three bytes
  D. by inserting 0xFFFE between the upper three bytes and the lower three bytes of the MAC address

  ---

  The modified EUI-64 format interface identifier is derived from the 48-bit link-layer (MAC) address by inserting the hexadecimal number FFFE between the upper three bytes (OUI field) and the lower three bytes (serial number) of the link layer address.

• Question 305:

  DRAG DROP Routing has been configured on the local router with these commands: Local(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.1 Local(config)# ip route 10.1.0.0 255.255.255.0 192.168.2.2 Local(config)# ip route 10.1.0.0 255.255.0.0 192.168.3.3 Drag each destination IP address on the left to its correct next hop address on the right.

  Select and Place:

  

  

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  If we have many entries matching for next hop ip address then the router will choose the one with most specific path to send the packet. This is called the “longest match” rule, the route with the most bits in the mask set to “1″ will be chosen to route packet

• Question 306:

  A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme? (Choose two.)

  A. 255.255.255.0
  B. 255.255.255.128
  C. 255.255.252.0
  D. 255.255.255.224
  E. 255.255.255.192
  F. 255.255.248.0
  B. 255.255.255.128
  E. 255.255.255.192

  ---

  Subnetting is used to break the network into smaller more efficient subnets to prevent excessive rates of Ethernet packet collision in a large network. Such subnets can be arranged hierarchically, with the organization's network address space (see also Autonomous System) partitioned into a tree-like structure. Routers are used to manage traffic and constitute borders between subnets. A routing prefix is the sequence of leading bits of an IP address that precede the portion of the address used as host identifier. In IPv4 networks, the routing prefix is often expressed as a "subnet mask", which is a bit mask covering the number of bits used in the prefix. An IPv4 subnet mask is frequently expressed in quad-dotted decimal representation, e.g., 255.255.255.0 is the subnet mask for the 192.168.1.0 network with a 24-bit routing prefix (192.168.1.0/24).

• Question 307:

  What occurs on a Frame Relay network when the CIR is exceeded?

  A. All TCP traffic is marked discard eligible.
  B. All UDP traffic is marked discard eligible and a BECN is sent.
  C. All TCP traffic is marked discard eligible and a BECN is sent.
  D. All traffic exceeding the CIR is marked discard eligible.
  D. All traffic exceeding the CIR is marked discard eligible.

  ---

  Committed information rate (CIR): The minimum guaranteed data transfer rate agreed to by the Frame Relay switch. Frames that are sent in excess of the CIR are marked as discard eligible (DE) which means they can be dropped if the

  congestion occurs within the Frame Relay network.

  Note: In the Frame Relay frame format, there is a bit called Discard eligible (DE) bit that is used to identify frames that are first to be dropped when the CIR is exceeded.

• Question 308:

  Which of these represents an IPv6 link-local address?

  A. FE80::380e:611a:e14f:3d69
  B. FE81::280f:512b:e14f:3d69
  C. FEFE:0345:5f1b::e14d:3d69
  D. FE08::280e:611:a:f14f:3d69
  A. FE80::380e:611a:e14f:3d69

  ---

  In the Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been reserved for link-local unicast addressing. The actual link local addresses are assigned with the prefix fe80::/64. They may be assigned by automatic (stateless) or stateful (e.g. manual) mechanisms.

• Question 309:

  Which command can be used from a PC to verify the connectivity between hosts that connect through a switch in the same LAN?

  A. ping address
  B. tracert address
  C. traceroute address
  D. arp address
  A. ping address

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  ICMP pings are used to verify connectivity between two IP hosts. Traceroute is used to verify the router hop path traffic will take but in this case since the hosts are in the same LAN there will be no router hops involved.

• Question 310:

  Which statement about VLAN operation on Cisco Catalyst switches is true?

  A. When a packet is received from an 802.1Q trunk, the VLAN ID can be determined from the source MAC address and the MAC address table.
  B. Unknown unicast frames are retransmitted only to the ports that belong to the same VLAN.
  C. Broadcast and multicast frames are retransmitted to ports that are configured on different VLAN.
  D. Ports between switches should be configured in access mode so that VLANs can span across the ports.
  B. Unknown unicast frames are retransmitted only to the ports that belong to the same VLAN.

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  Each VLAN resides in its own broadcast domain, so incoming frames with unknown destinations are only transmitted to ports that reside in the same VLAN as the incoming frame.