Computer networks worksheet with answers

Free printable Computer networks worksheet: 8 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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Name: ____________________   Date: ____________

1.Easy

Which protocol gives secure, encrypted remote login to another computer?

  1. ASNMP
  2. BTelnet
  3. CSSH
  4. DFTP
2.Easy

What is the main job of a firewall?

  1. ATo assign IP addresses to hosts
  2. BTo convert domain names into addresses
  3. CTo allow or block traffic according to security rules
  4. DTo speed up downloads by caching files
3.Easy

Which application protocol is used to request web pages from a web server?

  1. ASMTP
  2. BHTTP
  3. CARP
  4. DSNMP
4.Medium

What does an MX record in DNS specify?

  1. AThe name servers for a zone
  2. BAn alias name for another host
  3. CThe IPv4 address of a web server
  4. DThe mail servers that accept email for a domain
5.Medium

What is the network address of the host 192.168.10.77/26?

  1. A192.168.10.76
  2. B192.168.10.128
  3. C192.168.10.64
  4. D192.168.10.0
6.Medium

What is the role of a default gateway on a host?

  1. AIt is the DNS server
  2. BIt assigns MAC addresses
  3. CIt is the router used for traffic to other networks
  4. DIt is the switch port the host is connected to
7.Hard

In a SYN flood attack, what resource is the attacker trying to exhaust?

  1. AThe server's table of half-open connections
  2. BThe server's disk space
  3. CThe switch's MAC address table
  4. DThe DNS cache of the client
8.Hard

How does fragmentation differ in IPv6 compared with IPv4?

  1. AIPv6 routers fragment every packet larger than 64 bytes before forwarding it on the path
  2. BIPv6 fragments at the transport layer inside TCP
  3. CRouters never fragment IPv6 packets; only the source can, using path MTU discovery
  4. DIPv6 does not allow packets larger than 576 bytes

Answer key

  1. 1. C · SSH
  2. 2. C · To allow or block traffic according to security rules
  3. 3. B · HTTP
  4. 4. D · The mail servers that accept email for a domain
  5. 5. C · 192.168.10.64
  6. 6. C · It is the router used for traffic to other networks
  7. 7. A · The server's table of half-open connections
  8. 8. C · Routers never fragment IPv6 packets; only the source can, using path MTU discovery

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