LDN3: IPv4 in ICMP

Na računalniku smo pognali ukaz ifconfig. Rezultat ukaza predstavlja spodnji izpis. Kakšen je naslov omrežja v katerega je povezan naš računalnik?

We ran the ifconfig command on our computer. You can see the results in the listing below. What is the network address of the subnet that our computer is connected to?

eth1      Link encap:Ethernet  HWaddr 11:23:56:87:10:FC  
          inet addr:212.235.189.158  Bcast:212.235.189.159  Mask:255.255.255.224
          inet6 addr: 2001:1470:fffd::158/64 Scope:Global
          inet6 addr: fe80::250:56ff:fe87:183c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:26634951 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17855079 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1979988009 (1.8 GiB)  TX bytes:3001542164 (2.7 GiB)
          Interrupt:67 Base address:0x2024 

Kakšen je naslov broadcast v omrežju 192.168.17.0/255.255.255.0?

What is the broadcast address of the 192.168.17.0/255.255.255.0 subnet?

Ponudnik internetnih storitev nam je dodeli naslove iz omrežja 212.235.189.0/24. V podjetju imamo 2 računalniški učilnici (vsaka ima po 30 računalnikov), 20 strežnikov in 67 računalnikov za zaposlene. Kako lahko najbolj optimalno (minimiziramo število neizkoriščenih naslovov vmesnikov) razdelimo dodeljeni naslovni prostor?

Our Internet Service Provider assigned us the 212.235.189.0/24 subnet. Our company has 2 computer classrooms with 30 computers each, 20 servers and 67 computers for employees. How can we divide the address space most optimally (in terms of minimizing unused host addresses)? Please note that učilinca I equals classroom I, učilnica II equals classroom II, strežniki equals servers and zaposleni equals employees in the following answers.

Na usmerjevalniku smo izpisali zgornjo usmerjevalno tabelo. Označite tiste ciljne naslove, ki jih bo usmerjevalnik usmeril na prehod 10.0.0.3 na vmesniku eth1.

The routing table of our router is displayed above. Select the destination addresses that the router will send out to the gateway 10.0.0.3 on interface eth1.

V omrežje želimo priključiti 62 naprav. Katera maska določa najmanjše podomrežje, v katerega je še možno priključiti podano število naprav?

We want to connect 62 devices to a network. What mask defines the smallest subnetwork, in which we can connect these devices? 

Kako zapišemo masko /22 v desetiški obliki?

Write the /22 mask in a decimal form.

Katera sporočila protokola ICMP izkorišča program ping?

Which ICMP messages does the ping command use?

Kako zapišemo masko 255.255.255.128 v prefiksni (CIDR) obliki?

Write the 255.255.255.128 mask in the prefix (CIDR) form.

Oglejte si omrežje na sliki in označite samo trditve, ki veljajo za to omrežje. Vse omrežne kartice so va načinu promiscuous.

Examine the network on the diagram and select only the answers that apply to this network. All the network cards are set in promiscuous mode.

Na usmerjevalniku smo zasledili zapis podan v spodnji tabeli. Kaj pomeni ta vrstica v usmerjevalni tabeli?

In a routing table on a computer we saw the line above. What does this line mean?

Kakšen je naslov broadcast v omrežju 192.168.0.0/255.255.0.0?

What is the broadcast address of the 192.168.0.0/255.255.0.0 subnet?

Naš računalnik ima naslov IP 10.1.31.16 in masko podomrežja 255.192.0.0. Kateri je prvi naslov IP v tem omrežju IP, ki ga lahko uporabimo za naslov naprave?

Our computer's IP address is 10.1.31.16. Its subnet mask is 255.192.0.0. What is the first IP address that we can assign to a device in this network?

Na našem računalniku je naslov IP nastavljen na 172.16.32.96, maska podomrežja pa na 255.255.255.192. Kakšen je naslov broadcast v tem omrežju?

Our computer's IP address is 172.16.32.96. Its subnet mask is set to 255.255.255.192. What is the broadcast address of this network?

V omrežje želimo priključiti 64 naprav. Katera maska določa najmanjše podomrežje, v katerega je še možno priključiti podano število naprav?

We want to connect 64 devices to a network. What mask defines the smallest subnetwork, in which we can connect these devices?

Kakšen je največji naslov IP, ki ga lahko uporabimo za naslov naprave v omrežju, kjer je naslov IP našega računalnika 193.2.27.13/30?

What is the maximal IP that we can assign to a device in a network where our computer has its IP set to 193.2.27.13/30?

Katero polje paketa IPv4 (in njegovo spreminjanje na usmerjevalnikih) izkoriša program traceroute?

The traceroute program realies on a field in the IPv4 packet header (and the value of that field as the packet traverses routers). Which field is this?

Naslov 224.0.17.30 je:

224.0.17.30 is:

Označite naslove, ki jih lahko uporabimo za interna omrežja, ki ne bodo vidna zunaj naše organizacije. Upoštevajte, da je omrežje znotraj organizacije sestavljeno iz več podomrežij med katerimi je potrebno usmerjanje.

Select the network addresses that we can use on an internal company network. This addresses do not have to be seen from the public Internet. Also consider that our company network comprises of different subnets and that routing is required between the segments.