Chapter 4's Review Questions

1: What IOS command assists in determining detailed information if the router is propagating RIP updates?
A1: Answer: debug ipx routing activity
2: What IOS command assists in determining detailed information if the router is propagating SAP updates?
A2: Answer: debug ipx sap activity
3: What is the difference between the Novell internal IPX number and the Novell external IPX number?
A3: Answer: The internal IPX number is a logical network inside the Novell server. Think of it like the loopback on a Cisco router. The internal network can also be configured on Cisco routers and must be for certain features such as IPXWAN or NLSP. The external IPX number is the wire ID analogous to IP subnets.
4: Fill in the following table with the missing Cisco and Novell encapsulation names.
Cisco EncapsulationNovell Frame TypeDescriptionNovell Version Default
ARPAEthernet_IIEtherType pointer to Layer 3NetWare 6.x NetWare 5.x
SAP Length field 802.2 LLC SAP pointer to Layer 3NetWare 3.12 through NetWare 4.x
Novell-Ether Length field≦ NetWare 3.11
 Ethernet_SNAPLength field

802.2 LLC SAP

SNAP header		SNAP default for Token Ring and FDDI
  Serial linksAll versions for serial links

A4: Answer: See Table 4-5
5: What type of packet does Figure 4-18 display? What form of Cisco encapsulation is used?

Figure 4-18. Review Question 5

[View full size image]

A5: Answer: Frame 2 is a CDP multicast packet. The encapsulation is Cisco SNAP, which is 802.3 with 802.2 LLC, and SNAP headers.
6: Explain the difference between Cisco ping and IPX ping. Which one is the default? Why would you change the default? How do you change the default?
A6: Answer: The default ping is a Cisco ping that uses IPX protocol number 2. The IPX official ping uses socket number 0x9086. Cisco ping works fine for your Cisco devices, but your IPX devices do not understand its proprietary nature.
7: MTU is negotiated by NCP. It is 1500 for a local Ethernet segment and 576 bytes for the internetwork. How can you verify this?
A7: Answer: Technically, MTU is not being negotiated; rather, it is a per-interface attribute. But via the optional “big packet” request/response, the end-to-end NCP segment size is negotiated. However, the show interfaces (see the following output) or show tech-support commands display it. 
									------------------ show interfaces ------------------
Ethernet0 is up, line protocol is up
Hardware is Lance, address is 0000.0c8d.6705 (bia 0000.0c8d.6705)
  Description: r1e0 to hosta and hostb
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255

8: The route print command displays the routing table on a PC. How can you see this information on a router running IPX RIP? How about on a Novell server?
A8: Answer: View the routing table using the show ipx route command on the router and display networks on the Novell server.
9: How do you configure IPX RIP on a Cisco router?
A9: Answer: Configure the ipx routing global command and specify the wire IDs on the interface using the ipx network [wireid] command for each directly connected network.
10: Why doesn't IPX need ARP?
A10: Answer: ARP is not needed in IPX because the host address is already part of the network address in IPX: Network.node:socket.
11: Explain the following address:

12345678.0000.0000.0001:0451

A11: Answer: Internal IPX address:socket.
12: How does IPX RIP find the best path to another network? How does this differ from IP RIP?
A12: Answer: IPX RIP metrics are ticks/hops. IP metrics are hops. Both are limited to 15 hops.
13: In the chapter scenario, hosta is a Windows 2000 box. What command gives you the display in Figure 4-19?

Figure 4-19. Review Question 13


A13: Answer: Type ipxroute config at the hosta command prompt to see the network addresses, MAC address, and frame type information on the IPX client.
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